Sorry for the inconvinience - my server suddenly got unavailable, this means several omnimaga services are unavailable until i look into it (I'll do that tomorrow, i'll have to find my admin pannel passwd)
Withunder these services:
 - omnimaga image uploader (also the hosted images)
 - omnimaga radio (as if somepony uses it )
 - the so-often used irc bots (like 'test' and '@google')
 - other stuff I forgot?

Is OmnomIRC affected btw? (I can't check right now on Tapatalk)

OmnomIRC is not on my server.
And I also got good news: my server is back up again (i didn't have to do anything at all!)

And I have no idea what caused it......

Maybe your hosting service had problems ? Logs will probably give you some hints.

Which logs?
I usually don't log >.<

Ok, i checked my admin pannel and according to my provider it was a DNS Amplification Attack

Yeah, the DNS servers are used to magnify the messages, with a bandwidth of 100mbit/sec you could reach like 10 gbit/sec to attack your server.....kinda evil

yeah, people are so clever when it comes to attacks.....and that was the problem: some server of my provider was attacked, unlickley it was mine, and they had to shut their dns server down to prevent that.

i think nginx itself still logs, but in all the nginx configs i didn't define logs.
Also I don't like looking through log files, they are too big >.<

BTW: the new-posting-bot once crashed due to not being able to log to the file, the hdd was full (thus that bot doesn't log anymore ^^)