Someone over on reddit linked to a good post on properly closing a frozen SSH session.
It also includes other useful escape sequences.
By Ryan McCoskrie
I am a nerd trapped in the country side of North Canterbury, New Zealand trying to get an IT-related career off of the ground.
Ryan McCoskrie is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com
I'm also signed up with Fishpond but they aren't as strict about this stuff.