I've had this too a couple times, never found a proper fix. Sometimes reverting commit 24e0784d in darkplaces repo helped, one time we had to create a completely new linux user because the game wouldn't run under the old one no matter what. I heard it could be related to bad IPv6 support in dpmaster but your server seems to have IPv4 too (so does ours) so not sure what the problem is.
I assumed it's some kind of glitch on the master server- it probably is too.
I've had this before when the server restarts, but it always seems to correct itself in sometime. However now it's been stuck as is for weeks by now.
Where's the source code for it and/or who maintains it?
Found some source
here not sure if it's the same version as runs on deathmask but given the lack of commits there are probably not many recent versions anyway
Some contact info can be found
here. Note there are 2 more dpmasters run by other people (adresses you can find in the relevant cvars) but i really don't know anything about them or any of the people involved.
The other two are either down or aren't dpmaster servers anymore.
http://ghdigital.com/
is some kind of resume.
http://dpmaster.tchr.no/
The site is either not in use, being developed, or is undergoing routine maitenance.
Please come back later or check the news section at www.apario.net for any messages of
errors or planned maitenance.
They're working fine (just checked), but don't have a web interface like deathmask. If you wanna see what they see, use
this script. I don't know why there are such big differences in the number of servers on each one.