Unable to connect to server with Local Clients

[TheDreadPirate]

You really should setup a static address. The address change to 192.168.1.126, not 125. Or was it always 126?

Also, can you describe your networking setup? I see an oddity in the netplan output.

Code:

Routes: default via 192.168.1.254 metric 20100 (dhcp)

Based on what I am reading, when the metric is 20100 that means that the OS determined that this particular interface doesn't have access to the Internet.

What happens when you run this variation of the ping command? Forcing it to use your actual NIC and not your VPN.

Code:

ping -I enp0s25 -c -1 google.com

Or is the enp0s25 metrics 20100 DUE TO the VPN?

[TheDreadPirate]

Since you have PMs blocked I can't respond to your PM.

In my last post I speculated that the VPN interface is the problem.  Due to the route for your actual LAN is given a very high "metric", it is never used.  Try removing the VPN entirely from the server so that the VPN interface is removed.  Then reboot the server.