Server not showing up in servers list

I set up a Xonotic server (0.8.1) some time ago. It was sv_public 0 for most of the time, I had it added to favorites and it showed in the servers list just fine.

Since yesterday it's sv_public 1, but there is some problem with it showing up on the servers list. Even on machines where I have it favored it doesn't show up. Once in a while it pops up, but mostly not .

The server is behind NAT, but it's forwarded on firewall and works fine. Are tyhere any other ports except 26000 that need to be forwarded? Or maybe it's the NAT problem? The server might be reporting the internal IP, instead of the one needed to connect to it - how do I make it report the correct address? I tried setting net_address, but that's not it.

Can you see the server here? Can you connect to it manually (using 'connect <ip>:<port>' in console)?

I checked earlier on that list & it's also not there, but it's totally connectible & working, you can try yourself: 94.42.83.193:26000

I have this problem too sometimes. I'll be looking for a certain server and it doesn't show up on the server list. I have to connect manually even though I know other people can see the same server on the list.

I had similar problems a few times but with the git version (are you sure you're using 0.8.1 and not autobuild?). One time nothing helped except using a different linux user for the server. The other time, i reverted the 24e0784d14f2f7c24e7a44701162e1f988f11672 commit in darkplaces as it sometimes has issues with IPv6.

I'm fully sure it's running from the official zip on the website & it's running as a normal (non-root) user.

Anyway - are there any docs (except analyzing the code) on how the registering on the master server works? Perhaps it could shed some light on this. I checked the wiki & found nothing.