Nautilus freezes if mounted SSHFS-Device is unreachable
Solution 1:
This is Bug 657208 in GNOME Bugzilla.
Update:
Also there is a possible workaround found in SSHFS FAQ:
sshfs hangs after a while
Mounting works fine, I can use the files in Mountpoint as good as any other files on my system, but after bit of time, changing nothing on the remote files sshfs crashes. This means, I can not cd into the Mountpoint (xterm hangs, nautilus hangs... every program trying to access the Mountpoint gets stuck, and won't return).
Solution: add
ServerAliveInterval 15
in your
.ssh/config
(or use-o ServerAliveInterval=15
on the sshfs command line but I did not test that solution). This will force the ssh connection to stay alive even if you have no activity.