I developed my own dashboard and displying powerbi dashboad and reports with dataset refresh feature. it was working fine for the last one year but for the last few days suddenly it stop working and showing " The underlying connection was closed: An unexpected error occurred on a send ".

Just for more clarity i was following below steps to refresh the dataset as well as display reports

Refresh Data set:

1. Generate the Access token : getting access token

2. call API https://api.powerbi.com/v1.0/myorg/groups/{0}/datasets/{1}/refreshes passing groupid, datasetid, token etc

Here i am getting error: " The underlying connection was closed: An unexpected error occurred on a send "

Same error while try to get information for reports.

issue resolved with the help of microsoft support.

Support for transport layer security (TLS) 1.0 and 1.1 for Power BI will end in June 2020. Upgrade the TLS version of your Power BI application to TLS 1.2 before then.

Solution: Adding followung code

System.Net.ServicePointManager .SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

Follow below post suggested by microsoft support team:

https://azure.microsoft.com/en-in/updates/power-bi-support-for-transportlayer-security/

https://community.powerbi.com/t5/Issues/Embedded-Power-BI-is-not-working/idi-p/1185996#comments

issue resolved with the help of microsoft support.

Support for transport layer security (TLS) 1.0 and 1.1 for Power BI will end in June 2020. Upgrade the TLS version of your Power BI application to TLS 1.2 before then.

Solution: Adding followung code

System.Net.ServicePointManager .SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

Follow below post suggested by microsoft support team:

https://azure.microsoft.com/en-in/updates/power-bi-support-for-transportlayer-security/

https://community.powerbi.com/t5/Issues/Embedded-Power-BI-is-not-working/idi-p/1185996#comments

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