SSH connection close unexpectedly

czappi · Dec 4, 2005, 6:01 PM

I Have follow problem with my Wrap when i use shell over SSH the connection unexpectedly close connection.
the pftop over ssh work without disconnect.

darrendavid · May 19, 2006, 4:15 PM

I'm getting the same issue now as well. However, I have narrowed the problem to: connecting from within my LAN to ssh on an external IP that is portforwarded to inside the LAN. Basically I'm portforwarding 1.2.3.5:22 (WAN, aliased IP) to 10.0.1.10:22. When I connect to 1.2.3.5:22 from an internal client, say, 10.0.1.100, the connection lasts all of about 5 seconds before shutting down. However, if I connect directly to 10.0.1.10:22, the connection is stable. Could this be an issue with NAT reflection?

thanks,
darren

sullrich · May 19, 2006, 5:20 PM

@darrendavid:

I'm getting the same issue now as well. However, I have narrowed the problem to: connecting from within my LAN to ssh on an external IP that is portforwarded to inside the LAN. Basically I'm portforwarding 1.2.3.5:22 (WAN, aliased IP) to 10.0.1.10:22. When I connect to 1.2.3.5:22 from an internal client, say, 10.0.1.100, the connection lasts all of about 5 seconds before shutting down. However, if I connect directly to 10.0.1.10:22, the connection is stable. Could this be an issue with NAT reflection?

thanks,
darren

No, its not related to NAT reflection. Turn on keep-alives on your SSH client.

darrendavid · May 19, 2006, 5:25 PM

wonderful, that fixed it. For my own edification, tho, what does pfsense do from a configuration standpoint that requires keep-alives? I've never needed them before in any other pf-based firewall config.

thanks for the quick response,
darren

sullrich · May 19, 2006, 5:26 PM

You can also change the optimization level in System -> Advanced.