Softether, all 4.x versions fail to work correctly with latest updates on Ubuntu 22.04.02

[dsholm]

I went through many troubleshooting steps and posts for V5 github and discovered this is very likely an issue with Ubuntu 22.04.02

The server works fine, it is the client that is the problem, is this the correct way to report these issues?

I tried 4.29,4.38 and 4.42. The server side is Ubuntu 22.04.02 latest updates and serves Windows clients running 4.42 without issue. It is also serving Linux 5.x client as well (thank goodness there is a solution) now successfully.

U18.04 4.29+ [client] --> U22.04.02 4.42 [server] OK
U20.04 4.38+ [client] --> U22.04.02 4.42 [server] OK
Windows 10/11 4.42 [client] --> U22.04.02 4.42 [server] OK
U22.04.02 4.29/4.38/4.42 [client] --> U22.04.02 4.42 [server] BAD!
U22.04.02 5.02 [github client] --> U22.04.02 4.42 [server] OK

This is likely an OpenSSL issue, not confirmed, but likely.

[dsholm]

If OpenSSL is not the issue, it could also be that the client is verifying the server certificate based on CN vs SAN. This would be an RFC violation, it states that if a SAN is present, the CN must be ignored.