Suspect installed Windows 11 June 11, 2024—KB5039212 (OS Builds 22621.3737 and 22631.3737) cause the WSL can't access host's TCP port

Question

My PC (host) info:

版本	Windows 11 家庭中文版    
版本号	23H2    
安装日期	‎2024/‎4/‎7    
操作系统版本	22631.3737     
序列号	XXXXXX    
体验	Windows Feature Experience Pack 1000.22700.1009.0

My WSL info:

WSL 版本： 2.2.4.0     
内核版本： 5.15.153.1-2     
WSLg 版本： 1.0.61     
MSRDC 版本： 1.2.5326     
Direct3D 版本： 1.611.1-81528511     
DXCore 版本： 10.0.26091.1-240325-1447.ge-release     
Windows 版本： 10.0.22631.3737  

I have a service running in my host with TCP port 7890 and 8384, and in WSL, before, can accessing those ports properly. Last night I installed the Windows 10 June 11, 2024—KB5039212 (OS Builds 22621.3737 and 22631.3737) update, and this morning, I can't get connected to those hosted service anymore from WSL, I've tried:

ping 10.255.255.254     
PING 10.255.255.254 (10.255.255.254) 56(84) bytes of data.     
64 bytes from 10.255.255.254: icmp_seq=1 ttl=64 time=0.028 ms     
64 bytes from 10.255.255.254: icmp_seq=2 ttl=64 time=0.029 ms     
64 bytes from 10.255.255.254: icmp_seq=3 ttl=64 time=0.026 ms     
^C     
--- 10.255.255.254 ping statistics ---     
3 packets transmitted, 3 received, 0% packet loss, time 2091ms     
rtt min/avg/max/mdev = 0.026/0.027/0.029/0.001 ms

so the PING is good, But the telnet always failed:

telnet 10.255.255.254 8384     
Trying 10.255.255.254...     
telnet: Unable to connect to remote host: Connection refused

Also, I even tried turned off all firewalls(though it's not necessary before), and tried again, still no luck.

Could you take a look?

Answer 1

Hi Shawn jun,

Thank you for posting in Q&A forum.

First, you can uninstall the update to see if that fixes the problem. To do this, go to Windows Update > Settings > View updates & security > Update history > Uninstall updates. Find the update and click Uninstall.

I hope the information above is helpful.

Best regards

Zunhui

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