ssh reliability problems

[Andrew Schulman]

> tunneling X traffic over ssh seems to fail at the four to six hour mark.
>   all the connections shutdown with little reported information.  Normal
> ssh sessions stay running fine.

autossh might help.  It starts ssh sessions and periodically checks them to
make sure that they're still passing data-- if they're not, it terminates
them and starts a new one.  This is often helpful, but maybe not in your
case, since you say that other tunnels are still good after the X tunnels
fail.  I don't know what would cause that.

Good luck,
Andrew.