It seems the UnrealIRCd source had a backdoor inserted a while back, and three of our servers (resync, xiphos, and hercules) had been built from the backdoored source. Since resync was already due for retirement and has not been in DNS for quite a while now, we just retired it a little earlier. The other two servers, hercules and xiphos, will be down until further notice; the DNS entries have already been replaced, so you would have been connected to an alternative server automatically.