Did this issue resolve itself? The hostname issue may have been a temporary DNS glitch. The others may have been related to updating issues on the server side. If it's resolved now, though, I don't guess it's an issue any longer.
It may be a temporary DNS glitch, raenis is correct. I have changed the ttl to 60 seconds in preparation for moving smp1-4 to better hardware (new ips). I think MC may cache bad DNS hits, try closing MC and starting it again