This is really a problem that I have had since I installed F21. It was a clean install, not an update.
Anyway, when I connect to various servers that are setup for user/paswd login, it is a while before I see the password prompt.
After working on the system for a while, the session is suddenly unresponsive. I can ping the destination, but nothing in the ssh session. Usually after some time (more than a minute) the session resumes responding.
If I leave a session connected and move away from it, eventually I get a "Write failed: Broken pipe"
All the systems I am connecting to are on other networks, so I am going through a firewall that permits my ssh connections.
Any hints where to look? Wireshark is not showing me anything, but I may just be using the wrong filters.