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Describe the bug

D:\Program Files\npc>"D:\Program Files\npc\npc.exe"
2020/11/17 09:52:48.110 [I] [npc.go:231] the version of client is 0.26.9, the core version of client is 0.26.0
2020/11/17 09:52:48.226 [I] [control.go:97] Loading configuration file D:\Program Files\npc\conf\npc.conf successfully
2020/11/17 09:52:48.905 [I] [local.go:74] start local file system, local path /Users/liuhe/Downloads, strip prefix /web/ ,remote port 19008
2020/11/17 09:52:48.934 [N] [control.go:176] web access login username:user password:1234
2020/11/17 09:52:48.935 [I] [local.go:115] successful start-up of local tcp monitoring, port 2002
2020/11/17 09:52:48.935 [I] [local.go:115] successful start-up of local tcp monitoring, port 2001
2020/11/17 09:52:49.146 [I] [client.go:72] Successful connection with server nps.???????.top:8024
2020/11/17 09:52:49.936 [N] [local.go:142] try to connect to the server 1
2020/11/17 09:52:50.186 [E] [control.go:290] strconv.Atoi: parsing "": invalid syntax
2020/11/17 09:52:50.334 [E] [control.go:310] strconv.Atoi: parsing "": invalid syntax
2020/11/17 09:52:50.224 [E] [control.go:290] strconv.Atoi: parsing "": invalid syntax
2020/11/17 09:52:50.610 [E] [control.go:310] strconv.Atoi: parsing "": invalid syntax
2020/11/17 09:52:50.523 [E] [client.go:126] strconv.Atoi: parsing "": invalid syntax
2020/11/17 09:52:50.749 [E] [local.go:206] strconv.Atoi: parsing "": invalid syntax
2020/11/17 09:52:50.750 [N] [local.go:142] try to connect to the server 2
2020/11/17 09:52:51.005 [E] [control.go:290] strconv.Atoi: parsing "": invalid syntax
2020/11/17 09:52:51.086 [E] [control.go:310] strconv.Atoi: parsing "": invalid syntax
2020/11/17 09:52:51.021 [E] [local.go:206] listen udp 192.168.2.12:59891: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.
2020/11/17 09:52:51.106 [N] [local.go:142] try to connect to the server 3
2020/11/17 09:52:51.106 [E] [client.go:126] strconv.Atoi: parsing "": invalid syntax

To Reproduce
Steps to reproduce the behavior:

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See error

服务器端曾经装过旧版本

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots or logs
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Server (please complete the following information):

OS: Ubuntu 18.04.4 LTS

ARCH: Amd64

Tunnel

Version 0.26.9

Client (please complete the following information):

OS: Windows10

ARCH: Amd64

Tunnel

Version 0.26.9

Additional context
客户端语法错误

模式客户端 去链接服务器端 8023和8022端口 但是实际服务器端并没有监听 这两个端口 。
这是什么情况

tcp6 0 0 :::8024 :::* LISTEN 26916/nps
tcp6 0 0 :::443 :::* LISTEN 26916/nps
tcp6 0 0 :::80 :::* LISTEN 26916/nps
tcp6 0 0 :::8080 :::* LISTEN 26916/nps

后连接的提示
2020/12/01 10:47:35.098 [I] [control.go:102] Reconnecting...
2020/12/01 10:47:40.331 [E] [control.go:146] The server returned an error, which port or host may have been occupied or not allowed to open. c.o.com
2020/12/01 10:47:40.332 [I] [control.go:102] Reconnecting...

Only one usage of each socket address (protocol/network address/port) is normally permitted.