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[GH-ISSUE #2865] 最近客户端连接失败，i/o timeout. frp被墙？ #2287
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Reference: github-starred/frp#2287
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Originally created by @SwaySZ on GitHub (Mar 22, 2022).
Original GitHub issue: https://github.com/fatedier/frp/issues/2865
Bug Description
校园网客户端，腾讯云服务端，tcping服务器端口正常，一旦执行frpc后无法再tcping；换了若干端口，出现相同现象。PS:外网（如开热点连接）客户端一切正常。难道端口被墙了？
frpc Version
0.38-0.40
frps Version
0.40
System Architecture
linux/amd64
Configurations
frcp.ini
##############
[common]
server_addr = xxx
server_port = xxx
token = xxx
[ssh]
type = tcp
local_ip = 127.0.0.1
local_port = 22
remote_port = xxx
Logs
NA
Steps to reproduce
...
Affected area
@blizard863 commented on GitHub (Mar 23, 2022):
大概率是防火墙。
@SwaySZ commented on GitHub (Mar 23, 2022):
不清楚原理是啥？为啥只墙端口？防火墙是怎么侦测到的？是frp的什么特征触发了被墙？
@0xffffharry commented on GitHub (Mar 23, 2022):
实在不行就拿tls顶一下
@blizard863 commented on GitHub (Mar 23, 2022):
可以开启 KCP + TLS 试试
@marcuswang6 commented on GitHub (Apr 1, 2022):
同上，不知道什么情况
@marcuswang6 commented on GitHub (Apr 1, 2022):
请问怎么开启呢？
@SwaySZ commented on GitHub (Apr 2, 2022):
开启kcp连接不上。以上问题暂时无解，太奇怪了。
@799034552 commented on GitHub (Jun 1, 2022):
我也这样，怎么破
@SwaySZ commented on GitHub (Jun 2, 2022):
破不了
@bitcl2 commented on GitHub (Jul 9, 2022):
国内点对点也会被封端口，换一个端口同样只能存活几十秒。
@iSonce commented on GitHub (Aug 17, 2022):
一样的情况，阿里云的frp服务端开了，用校园网连不上
@799034552 commented on GitHub (Aug 17, 2022):
我们校园网加上tls加密就行了
tls_enable = true@iSonce commented on GitHub (Aug 17, 2022):
加上tls加密解决了（原来的7000端口墙了得换一个），十分感谢
@ysl2 commented on GitHub (Mar 2, 2023):
我们校园网是直接封ip