This is beyond weird. One of my remote VPN clients decided today to upgrade his 11.10 laptop to 12.10. Everything was working prior to that.
Now, his OpenVPN client connects (as usual) and I can ping his machine without issues. However, as soon there is any traffic over the tunnel (e.g. I
ssh to his machine and type
ls -al, I get two-three lines and the link is dead). Restarting the service repeats the process.
I've checked and re-checked his client.conf files and there is nothing in the logs that differs one iota from my setup (also 12.10, no issues) and there are no issues in the server logs. There is no way he can tell me what he clicked on during the upgrade (I'm suspecting it's one of those "do you want to overwrite conf files or keep the old ones?"). There is a 12.10 machine behind the same router he's on and its VPN works flawlessly.
Any idea where and what to look for?