If your users are having issues logging in to your OpenSSH Server for Windows Server after the latest October 2024 Windows Updates, this might help you:
Firstly, configure logging so that you can see what is happening:
Change the config file:
C:\ProgramData\ssh\sshd_config
SyslogFacility LOCAL0
Restart OpenSSH Service
In my environment i saw this error:
userauth_pubkey: signature algorithm ssh-rsa not in PubkeyAcceptedAlgorithms [preauth]
The solution is pretty straight forward. Add this line at the top of your OpenSSH config file:
C:\ProgramData\ssh\sshd_config
PubkeyAcceptedAlgorithms +ssh-rsa