Since I upgraded my laptop to OS X Lion, I was not able to connect to my iMac (still running OS X Snow Leopard) anymore. Neither with Screen Sharing nor with direct file access. A quick search in the web couldn’t help me further so I decided to investigate in the issue by myself. The first starting point was to look into the Console and see if there where any error logged while trying to connect to the iMac.
The following error occurred repeatedly in the file. Another search showed me the sources of mDNS but that wouldn’t help me out on that topic.
4/27/12 5:15:09.659 PM mDNSResponder: CacheRecordRmv ERROR!!: How can CurrentAnswers already be zero for 00007F9843836290 _kerberos._udp.MYDOMAIN.LOCAL. (SRV) DNSServer <>:0