Database mirroring stuck in suspended mode
First thing to try:
ALTER DATABASE Gandalf SET PARTNER RESUME;

Might work!  If you prefer you can do it with the GUI - Tasks / Mirror / Resume
Check logs for an Error 3624.
I get this occasionally - reading up on this, it looks very much like &quot;an error has occurred.&quot;
My solution is to stop mirroring and recreate.
I would be interested if anyone has better information.