SSH cannot connect to any non-local SSH servers on WSL 2

Recently, I encountered a strange problem. That is, I cannot connect to any non-local SSH servers from a WSL 2 terminal using the ssh client from WSL 2. However, I would not have any problem to connect to these SSH servers using ssh.exe from Windows and PuTTY or other SSH clients on Windows. Here is what I observe when I try to connect Github.com,

ssh -vvv -T ssh@github.com
OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d  10 Sep 2019
debug1: Reading configuration data /home/hui/.ssh/config
debug1: /home/hui/.ssh/config line 17: Applying options for github.com
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "github.com" port 22
debug2: ssh_connect_direct
debug1: Connecting to github.com [140.82.113.3] port 22.

The process hangs on "Connecting to ..." until times out. I attempted all of the methods discussed in this threads and the method of adding a Firewall rule for WSL, but to no avail in my case. The solution finally works for me is to restart the Windows Container Networking service.

Using PowerShell, we can restart the service on command line as follows,

PS C:\WINDOWS\system32> Restart-Service -Force -Name hns

The solution came to me because I wanted to restart the networking stack of WSL and to see if it would resolve this issue. The method to do it comes from this Github gist. To restart the networking stack of WSL, run the following commands,

# Restart the Host Network Service 
Restart-Service -Force -Name hns
# Restart the Windows Subsystem for Linux Manager
Restart-Service LxssManager
# Restart the WSL Network adapter
Restart-NetAdapter -Name "vEthernet (WSL)"

In my case, restarting the Windows Container Networking service (hns) is sufficient for me to resolve the problem.

Reference

1. Reset your WSL network connection trying to fix WSL2 media disconnected error
2. WSL2 SSH can't connect to any public SSH server
3. SSH connections hanging from WSL2