After an upgrade to OSX 10.11.1 (El Capitan) I’ve had a number of issues with ssh-agent and screen sessions being lost after being open for a few days. The socket file in /var/folders was removed and the screen session became unusable and the ssh-agent session was also lost.
In El Capitan, the screen socket is stored in a temporary location like
I believe the issue is that OSX or a utility is cleaning files here inappropriately.
My temporary fix is to set the ssh-agent and screen socket directory to a location in my home directory, ie:
export SCREENDIR=~/.screen chmod 700 ~/.screen mkdir ~/.ssh-agent chmod 700 ~/.ssh-agent ssh-agent -a ~/.ssh-agent/agent.pid screen
This solution appears to work.