Hello All,
I am having a problem with https on graylog2.2.3, Currently using CentOS-7.3 all in one graylog2 server. This is a Virtual machine with 8 cores, 10 GB of ram and 1 Tb storage.
I created an Input for Localhost and tested to received messages, completed. No problems.
I attempted to use the following:
http://docs.graylog.org/en/2.2/pages/configuration/https.html

Unfortunately, toward the end of the page I was having problems with JVM to pick up the new trust store. So, I attempted to follow these instructions as shown below;
GitHub

This work flawlessly, logged in with https://ipaddress:9000/gettingstarted
Some problems were noticed, for example: My Input created for Localhost now shows [0 Running] and I cannot start them (i.e. it errors out “unable to start input”), but I’m receiving messages from localhost on that Input, Kind of weird. The Second Problem noticed is when I navigate to System > Logging see the following;
ff45be84 / test-graylog.enseva-labs.net Has written a total of n/a internal log messages. If I Click on the link “ff45be84 / test-graylog.enseva-labs.net ” I receive the following error:
We had trouble fetching some data required to build this page, so here is a picture instead. Error: cannot GET https://ipaddres:9000/api/cluster/ff45be84-46ee-47b5-a46e-5a3fef085c73/jvm (500)

Check your Graylog logs for more information.
Graylog files continue to show the following error;
2017-10-17T21:02:34.077-05:00 WARN [ProxiedResource] Unable to call https://ipaddress:9000/api/system/metrics/multiple on node javax.net.ssl.SSLPeerUnverifiedException: Hostname ipaddress not verified: certificate: sha256/8gOPCINQyuUol2SFmo0WXrP+TBYWeHxgqtp9f9ENct0= DN: CN=Unknown, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown

I’ve been googling for 5 days trying to figure out how to solve this problem. Any help or direction to solve this problem would be appreciated.
Thank you in advance

I fixed my problem. I was trying to use an IP Address instead of FQDN.
I had to do some reconfiguring.

rest_listen_uri = http://FQDN:9000/api/
web_listen_uri = http://FQDN:9000/
I restarted my Graylog server, everything works as expected.

I should of waited before posting.
              
Hi @gsmith
I am trying the same setup in one of my Google Cloud Platform and I am getting the same exception in logs when I am trying to navigate some other page in Graylog. I followed this link to setup the SSL
2017-11-02T06:42:22.847Z WARN  [ProxiedResource] Unable to call https://localhost:9000/api/system/metrics/multiple on node <317427ae-de50-4ae6-a100-e9137244d6d8>
javax.net.ssl.SSLPeerUnverifiedException: Hostname: XXXXX not verified:
    certificate: sha256/Q+bQmmOWmFLeDy1Rs80WMVC3AlQI4ihpj+2Y+IL4fAI=
    DN: CN=manik basha, OU=39.164.202.35.bc.googleusercontent.com., O=39.164.202.35.bc.googleusercontent.com., L=mumbai, ST=maharastra, C=IN
    subjectAltNames: []
        at okhttp3.internal.connection.RealConnection.connectTls(RealConnection.java:290) ~[graylog.jar:?]
        at okhttp3.internal.connection.RealConnection.establishProtocol(RealConnection.java:251) ~[graylog.jar:?]
        at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:151) ~[graylog.jar:?]
        at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:192) ~[graylog.jar:?]
        at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:121) ~[graylog.jar:?]
        at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:100) ~[graylog.jar:?]
        at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67) ~[graylog.jar:?]
        at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67) ~[graylog.jar:?]
        at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92) ~[graylog.jar:?]
        at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67) ~[graylog.jar:?]
        at org.graylog2.rest.RemoteInterfaceProvider.lambda$get$0(RemoteInterfaceProvider.java:59) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92) ~[graylog.jar:?]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67) ~[graylog.jar:?]
        at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:185) ~[graylog.jar:?]
        at okhttp3.RealCall.execute(RealCall.java:69) ~[graylog.jar:?]
        at retrofit2.OkHttpCall.execute(OkHttpCall.java:180) ~[graylog.jar:?]
        at org.graylog2.shared.rest.resources.ProxiedResource.lambda$getForAllNodes$0(ProxiedResource.java:76) ~[graylog.jar:?]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_144]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_144]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_144]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
I have uploaded my Graylog conf file please kindly check and correct me If I am doing anything wrong in the setup.
############################
# GRAYLOG CONFIGURATION FILE
############################
# This is the Graylog configuration file. The file has to use ISO 8859-1/Latin-1 character encoding.
# Characters that cannot be directly represented in this encoding can be written using Unicode escapes
# as defined in https://docs.oracle.com/javase/specs/jls/se8/html/jls-3.html#jls-3.3, using the \u prefix.
# For example, \u002c.
# * Entries are generally expected to be a single line of the form, one of the following:
# propertyName=propertyValue
# propertyName:propertyValue
# * White space that appears between the property name and property value is ignored,
#   so the following are equivalent:
# name=Stephen
# name = Stephen
# * White space at the beginning of the line is also ignored.
# * Lines that start with the comment characters ! or # are ignored. Blank lines are also ignored.
# * The property value is generally terminated by the end of the line. White space following the
#   property value is not ignored, and is treated as part of the property value.
# * A property value can span several lines if each line is terminated by a backslash (‘\’) character.
#   For example:
# targetCities=\
#         Detroit,\
#         Chicago,\
#         Los Angeles
#   This is equivalent to targetCities=Detroit,Chicago,Los Angeles (white space at the beginning of lines is ignored).
# * The characters newline, carriage return, and tab can be inserted with characters \n, \r, and \t, respectively.
# * The backslash character must be escaped as a double backslash. For example:
# path=c:\\docs\\doc1
# If you are running more than one instances of Graylog server you have to select one of these
# instances as master. The master will perform some periodical tasks that non-masters won't perform.
is_master = true
# The auto-generated node ID will be stored in this file and read after restarts. It is a good idea
# to use an absolute file path here if you are starting Graylog server from init scripts or similar.
node_id_file = /etc/graylog/server/node-id
# You MUST set a secret to secure/pepper the stored user passwords here. Use at least 64 characters.
# Generate one by using for example: pwgen -N 1 -s 96
password_secret = IxtU2Wjsr7ml6CAICvRzNvkerAXTbvH5dVFmUmCjW2rU0aEnAv7LLwvBVbx3wBN
# The default root user is named 'admin'
#root_username = admin
# You MUST specify a hash password for the root user (which you only need to initially set up the
# system and in case you lose connectivity to your authentication backend)
# This password cannot be changed using the API or via the web interface. If you need to change it,
# modify it in this file.
# Create one by using for example: echo -n yourpassword | shasum -a 256
# and put the resulting hash value into the following line
root_password_sha2 = e3c652f0ba0b4801205814f8b6bc47770bb89b22cdeb4e951
# The email address of the root user.
# Default is empty
#root_email = ""
# The time zone setting of the root user. See http://www.joda.org/joda-time/timezones.html for a list of valid time zones.
# Default is UTC
#root_timezone = UTC
# Set plugin directory here (relative or absolute)
plugin_dir = /usr/share/graylog-server/plugin
# REST API listen URI. Must be reachable by other Graylog server nodes if you run a cluster.
# When using Graylog Collectors, this URI will be used to receive heartbeat messages and must be accessible for all collectors.
rest_listen_uri = http://10.128.0.7:9000/api/
# REST API transport address. Defaults to the value of rest_listen_uri. Exception: If rest_listen_uri
# is set to a wildcard IP address (0.0.0.0) the first non-loopback IPv4 system address is used.
# If set, this will be promoted in the cluster discovery APIs, so other nodes may try to connect on
# this address and it is used to generate URLs addressing entities in the REST API. (see rest_listen_uri)
# You will need to define this, if your Graylog server is running behind a HTTP proxy that is rewriting
# the scheme, host name or URI.
# This must not contain a wildcard address (0.0.0.0).
rest_transport_uri = https://35.202.164.39:9000/api/
# Enable CORS headers for REST API. This is necessary for JS-clients accessing the server directly.
# If these are disabled, modern browsers will not be able to retrieve resources from the server.
# This is enabled by default. Uncomment the next line to disable it.
#rest_enable_cors = false
# Enable GZIP support for REST API. This compresses API responses and therefore helps to reduce
# overall round trip times. This is enabled by default. Uncomment the next line to disable it.
#rest_enable_gzip = false
# Enable HTTPS support for the REST API. This secures the communication with the REST API with
# TLS to prevent request forgery and eavesdropping. This is disabled by default. Uncomment the
# next line to enable it.
rest_enable_tls = true
# The X.509 certificate chain file in PEM format to use for securing the REST API.
rest_tls_cert_file = /etc/graylog/graylog-certificate.pem
# The PKCS#8 private key file in PEM format to use for securing the REST API.
rest_tls_key_file = /etc/graylog/graylog-key.pem
# The password to unlock the private key used for securing the REST API.
rest_tls_key_password = secret
# The maximum size of the HTTP request headers in bytes.
#rest_max_header_size = 8192
# The maximal length of the initial HTTP/1.1 line in bytes.
#rest_max_initial_line_length = 4096
# The size of the thread pool used exclusively for serving the REST API.
#rest_thread_pool_size = 16
# Comma separated list of trusted proxies that are allowed to set the client address with X-Forwarded-For
# header. May be subnets, or hosts.
#trusted_proxies = 127.0.0.1/32, 0:0:0:0:0:0:0:1/128
# Enable the embedded Graylog web interface.
# Default: true
#web_enable = false
# Web interface listen URI.
# Configuring a path for the URI here effectively prefixes all URIs in the web interface. This is a replacement
# for the application.context configuration parameter in pre-2.0 versions of the Graylog web interface.
web_listen_uri = http://10.128.0.7:9000/
# Web interface endpoint URI. This setting can be overriden on a per-request basis with the X-Graylog-Server-URL header.
# Default: $rest_transport_uri
#web_endpoint_uri =
# Enable CORS headers for the web interface. This is necessary for JS-clients accessing the server directly.
# If these are disabled, modern browsers will not be able to retrieve resources from the server.
#web_enable_cors = true
# Enable/disable GZIP support for the web interface. This compresses HTTP responses and therefore helps to reduce
# overall round trip times. This is enabled by default. Uncomment the next line to disable it.
#web_enable_gzip = false
# Enable HTTPS support for the web interface. This secures the communication of the web browser with the web interface
# using TLS to prevent request forgery and eavesdropping.
# This is disabled by default. Uncomment the next line to enable it and see the other related configuration settings.
web_enable_tls = true
# The X.509 certificate chain file in PEM format to use for securing the web interface.
web_tls_cert_file =  /etc/graylog/graylog-certificate.pem
# The PKCS#8 private key file in PEM format to use for securing the web interface.
web_tls_key_file =  /etc/graylog/graylog-key.pem
# The password to unlock the private key used for securing the web interface.
web_tls_key_password = secret
# The maximum size of the HTTP request headers in bytes.
#web_max_header_size = 8192
# The maximal length of the initial HTTP/1.1 line in bytes.
#web_max_initial_line_length = 4096
# The size of the thread pool used exclusively for serving the web interface.
#web_thread_pool_size = 16
# List of Elasticsearch hosts Graylog should connect to.
# Need to be specified as a comma-separated list of valid URIs for the http ports of your elasticsearch nodes.
# If one or more of your elasticsearch hosts require authentication, include the credentials in each node URI that
# requires authentication.
# Default: http://127.0.0.1:9200
ielasticsearch_hosts = http://35.202.164.39:9200
#http://user:password@node2:19200
# Maximum amount of time to wait for successfull connection to Elasticsearch HTTP port.
# Default: 10 Seconds
#elasticsearch_connect_timeout = 10s
# Maximum amount of time to wait for reading back a response from an Elasticsearch server.
# Default: 60 seconds
#elasticsearch_socket_timeout = 60s
# Maximum idle time for an Elasticsearch connection. If this is exceeded, this connection will
# be tore down.
# Default: inf
#elasticsearch_idle_timeout = -1s
# Maximum number of total connections to Elasticsearch.
# Default: 20
#elasticsearch_max_total_connections = 20
# Maximum number of total connections per Elasticsearch route (normally this means per
# elasticsearch server).
# Default: 2
#elasticsearch_max_total_connections_per_route = 2
# Enable automatic Elasticsearch node discovery through Nodes Info,
# see https://www.elastic.co/guide/en/elasticsearch/reference/5.4/cluster-nodes-info.html
# WARNING: Automatic node discovery does not work if Elasticsearch requires authentication, e. g. with Shield.
# Default: false
#elasticsearch_discovery_enabled = true
# Filter for including/excluding Elasticsearch nodes in discovery according to their custom attributes,
# see https://www.elastic.co/guide/en/elasticsearch/reference/5.4/cluster.html#cluster-nodes
# Default: empty
#elasticsearch_discovery_filter = rack:42
# Frequency of the Elasticsearch node discovery.
# Default: 30s
# elasticsearch_discovery_frequency = 30s
# Enable payload compression for Elasticsearch requests.
# Default: false
#elasticsearch_compression_enabled = true
# Graylog will use multiple indices to store documents in. You can configured the strategy it uses to determine
# when to rotate the currently active write index.
# It supports multiple rotation strategies:
#   - "count" of messages per index, use elasticsearch_max_docs_per_index below to configure
#   - "size" per index, use elasticsearch_max_size_per_index below to configure
# valid values are "count", "size" and "time", default is "count"
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
rotation_strategy = count
# (Approximate) maximum number of documents in an Elasticsearch index before a new index
# is being created, also see no_retention and elasticsearch_max_number_of_indices.
# Configure this if you used 'rotation_strategy = count' above.
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
elasticsearch_max_docs_per_index = 20000000
# (Approximate) maximum size in bytes per Elasticsearch index on disk before a new index is being created, also see
# no_retention and elasticsearch_max_number_of_indices. Default is 1GB.
# Configure this if you used 'rotation_strategy = size' above.
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#elasticsearch_max_size_per_index = 1073741824
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure
#elasticsearch_disable_version_check = true
# Disable message retention on this node, i. e. disable Elasticsearch index rotation.
#no_retention = false
# How many indices do you want to keep?
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
elasticsearch_max_number_of_indices = 20
retention_strategy = delete
# How many Elasticsearch shards and replicas should be used per index? Note that this only applies to newly created indices.
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
elasticsearch_shards = 4
elasticsearch_replicas = 0
# Prefix for all Elasticsearch indices and index aliases managed by Graylog.
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
elasticsearch_index_prefix = graylog
# Name of the Elasticsearch index template used by Graylog to apply the mandatory index mapping.
# Default: graylog-internal
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#elasticsearch_template_name = graylog-internal
# Do you want to allow searches with leading wildcards? This can be extremely resource hungry and should only
# be enabled with care. See also: http://docs.graylog.org/en/2.1/pages/queries.html
allow_leading_wildcard_searches = false
# Do you want to allow searches to be highlighted? Depending on the size of your messages this can be memory hungry and
# should only be enabled after making sure your Elasticsearch cluster has enough memory.
allow_highlighting = false
# Analyzer (tokenizer) to use for message and full_message field. The "standard" filter usually is a good idea.
# All supported analyzers are: standard, simple, whitespace, stop, keyword, pattern, language, snowball, custom
# Elasticsearch documentation: https://www.elastic.co/guide/en/elasticsearch/reference/2.3/analysis.html
# Note that this setting only takes effect on newly created indices.
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
elasticsearch_analyzer = standard
# Global request timeout for Elasticsearch requests (e. g. during search, index creation, or index time-range
# calculations) based on a best-effort to restrict the runtime of Elasticsearch operations.
# Default: 1m
#elasticsearch_request_timeout = 1m
# Global timeout for index optimization (force merge) requests.
# Default: 1h
#elasticsearch_index_optimization_timeout = 1h
# Maximum number of concurrently running index optimization (force merge) jobs.
# If you are using lots of different index sets, you might want to increase that number.
# Default: 20
#elasticsearch_index_optimization_jobs = 20
# Time interval for index range information cleanups. This setting defines how often stale index range information
# is being purged from the database.
# Default: 1h
#index_ranges_cleanup_interval = 1h
# Batch size for the Elasticsearch output. This is the maximum (!) number of messages the Elasticsearch output
# module will get at once and write to Elasticsearch in a batch call. If the configured batch size has not been
# reached within output_flush_interval seconds, everything that is available will be flushed at once. Remember
# that every outputbuffer processor manages its own batch and performs its own batch write calls.
# ("outputbuffer_processors" variable)
output_batch_size = 500
# Flush interval (in seconds) for the Elasticsearch output. This is the maximum amount of time between two
# batches of messages written to Elasticsearch. It is only effective at all if your minimum number of messages
# for this time period is less than output_batch_size * outputbuffer_processors.
output_flush_interval = 1
# As stream outputs are loaded only on demand, an output which is failing to initialize will be tried over and
# over again. To prevent this, the following configuration options define after how many faults an output will
# not be tried again for an also configurable amount of seconds.
output_fault_count_threshold = 5
output_fault_penalty_seconds = 30
# The number of parallel running processors.
# Raise this number if your buffers are filling up.
processbuffer_processors = 5
outputbuffer_processors = 3
#outputbuffer_processor_keep_alive_time = 5000
#outputbuffer_processor_threads_core_pool_size = 3
#outputbuffer_processor_threads_max_pool_size = 30
# UDP receive buffer size for all message inputs (e. g. SyslogUDPInput).
#udp_recvbuffer_sizes = 1048576
# Wait strategy describing how buffer processors wait on a cursor sequence. (default: sleeping)
# Possible types:
#  - yielding
#     Compromise between performance and CPU usage.
#  - sleeping
#     Compromise between performance and CPU usage. Latency spikes can occur after quiet periods.
#  - blocking
#     High throughput, low latency, higher CPU usage.
#  - busy_spinning
#     Avoids syscalls which could introduce latency jitter. Best when threads can be bound to specific CPU cores.
processor_wait_strategy = blocking
# Size of internal ring buffers. Raise this if raising outputbuffer_processors does not help anymore.
# For optimum performance your LogMessage objects in the ring buffer should fit in your CPU L3 cache.
# Must be a power of 2. (512, 1024, 2048, ...)
ring_size = 65536
inputbuffer_ring_size = 65536
inputbuffer_processors = 2
inputbuffer_wait_strategy = blocking
# Enable the disk based message journal.
message_journal_enabled = true
# The directory which will be used to store the message journal. The directory must me exclusively used by Graylog and
# must not contain any other files than the ones created by Graylog itself.
# ATTENTION:
#   If you create a seperate partition for the journal files and use a file system creating directories like 'lost+found'
#   in the root directory, you need to create a sub directory for your journal.
#   Otherwise Graylog will log an error message that the journal is corrupt and Graylog will not start.
message_journal_dir = /var/lib/graylog-server/journal
# Journal hold messages before they could be written to Elasticsearch.
# For a maximum of 12 hours or 5 GB whichever happens first.
# During normal operation the journal will be smaller.
#message_journal_max_age = 12h
#message_journal_max_size = 5gb
#message_journal_flush_age = 1m
#message_journal_flush_interval = 1000000
#message_journal_segment_age = 1h
#message_journal_segment_size = 100mb
# Number of threads used exclusively for dispatching internal events. Default is 2.
#async_eventbus_processors = 2
# How many seconds to wait between marking node as DEAD for possible load balancers and starting the actual
# shutdown process. Set to 0 if you have no status checking load balancers in front.
lb_recognition_period_seconds = 3
# Journal usage percentage that triggers requesting throttling for this server node from load balancers. The feature is
# disabled if not set.
#lb_throttle_threshold_percentage = 95
# Every message is matched against the configured streams and it can happen that a stream contains rules which
# take an unusual amount of time to run, for example if its using regular expressions that perform excessive backtracking.
# This will impact the processing of the entire server. To keep such misbehaving stream rules from impacting other
# streams, Graylog limits the execution time for each stream.
# The default values are noted below, the timeout is in milliseconds.
# If the stream matching for one stream took longer than the timeout value, and this happened more than "max_faults" times
# that stream is disabled and a notification is shown in the web interface.
#stream_processing_timeout = 2000
#stream_processing_max_faults = 3
# Length of the interval in seconds in which the alert conditions for all streams should be checked
# and alarms are being sent.
#alert_check_interval = 60
# Since 0.21 the Graylog server supports pluggable output modules. This means a single message can be written to multiple
# outputs. The next setting defines the timeout for a single output module, including the default output module where all
# messages end up.
# Time in milliseconds to wait for all message outputs to finish writing a single message.
#output_module_timeout = 10000
# Time in milliseconds after which a detected stale master node is being rechecked on startup.
#stale_master_timeout = 2000
# Time in milliseconds which Graylog is waiting for all threads to stop on shutdown.
#shutdown_timeout = 30000
# MongoDB connection string
# See https://docs.mongodb.com/manual/reference/connection-string/ for details
mongodb_uri = mongodb://localhost/graylog
# Authenticate against the MongoDB server
#mongodb_uri = mongodb://grayloguser:secret@localhost:27017/graylog
# Use a replica set instead of a single host
#mongodb_uri = mongodb://grayloguser:secret@localhost:27017,localhost:27018,localhost:27019/graylog
# Increase this value according to the maximum connections your MongoDB server can handle from a single client
# if you encounter MongoDB connection problems.
mongodb_max_connections = 1000
# Number of threads allowed to be blocked by MongoDB connections multiplier. Default: 5
# If mongodb_max_connections is 100, and mongodb_threads_allowed_to_block_multiplier is 5,
# then 500 threads can block. More than that and an exception will be thrown.
# http://api.mongodb.com/java/current/com/mongodb/MongoOptions.html#threadsAllowedToBlockForConnectionMultiplier
mongodb_threads_allowed_to_block_multiplier = 5
# Drools Rule File (Use to rewrite incoming log messages)
# See: http://docs.graylog.org/en/2.1/pages/drools.html
#rules_file = /etc/graylog/server/rules.drl
# Email transport
#transport_email_enabled = false
#transport_email_hostname = mail.example.com
#transport_email_port = 587
#transport_email_use_auth = true
#transport_email_use_tls = true
#transport_email_use_ssl = true
#transport_email_auth_username = [email protected]
#transport_email_auth_password = secret
#transport_email_subject_prefix = [graylog]
#transport_email_from_email = [email protected]
# Specify and uncomment this if you want to include links to the stream in your stream alert mails.
# This should define the fully qualified base url to your web interface exactly the same way as it is accessed by your users.
#transport_email_web_interface_url = https://graylog.example.com
# The default connect timeout for outgoing HTTP connections.
# Values must be a positive duration (and between 1 and 2147483647 when converted to milliseconds).
# Default: 5s
#http_connect_timeout = 5s
# The default read timeout for outgoing HTTP connections.
# Values must be a positive duration (and between 1 and 2147483647 when converted to milliseconds).
# Default: 10s
#http_read_timeout = 10s
# The default write timeout for outgoing HTTP connections.
# Values must be a positive duration (and between 1 and 2147483647 when converted to milliseconds).
# Default: 10s
#http_write_timeout = 10s
# HTTP proxy for outgoing HTTP connections
#http_proxy_uri =
# Disable the optimization of Elasticsearch indices after index cycling. This may take some load from Elasticsearch
# on heavily used systems with large indices, but it will decrease search performance. The default is to optimize
# cycled indices.
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#disable_index_optimization = true
# Optimize the index down to <= index_optimization_max_num_segments. A higher number may take some load from Elasticsearch
# on heavily used systems with large indices, but it will decrease search performance. The default is 1.
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#index_optimization_max_num_segments = 1
# The threshold of the garbage collection runs. If GC runs take longer than this threshold, a system notification
# will be generated to warn the administrator about possible problems with the system. Default is 1 second.
#gc_warning_threshold = 1s
# Connection timeout for a configured LDAP server (e. g. ActiveDirectory) in milliseconds.
#ldap_connection_timeout = 2000
# Disable the use of SIGAR for collecting system stats
#disable_sigar = false
# The default cache time for dashboard widgets. (Default: 10 seconds, minimum: 1 second)
#dashboard_widget_default_cache_time = 10s
# Automatically load content packs in "content_packs_dir" on the first start of Graylog.
#content_packs_loader_enabled = true
# The directory which contains content packs which should be loaded on the first start of Graylog.
content_packs_dir = /usr/share/graylog-server/contentpacks
# A comma-separated list of content packs (files in "content_packs_dir") which should be applied on
# the first start of Graylog.
# Default: empty
content_packs_auto_load = grok-patterns.json
# For some cluster-related REST requests, the node must query all other nodes in the cluster. This is the maximum number
# of threads available for this. Increase it, if '/cluster/*' requests take long to complete.
# Should be rest_thread_pool_size * average_cluster_size if you have a high number of concurrent users.
proxied_requests_thread_pool_size = 32
My Google cloud VM  has two IP’s internal & external… I have configured internal IP

rest_listen_uri = http://X.XXX.XX.X:9000/api/

web_listen_uri = http://XX.XXX.XX.X:9000/




    

Configured External IP in rest_transport_uri = https://X.XXX.XX.X:9000/api/
Please correct me if I am doing anything wrong and if possible can you please share your graylog.conf for reference.
Thanks,

Ganeshbabu R
              
@Ganeshbabu
This is what help solve my issues as shown below;

I’m running CentOS 7.3, All in one Graylog Server.
This site is how I setup my Test environment. I used the same Version of elasticsearch and MongoDb