In my case it was due to an Intrusion Detection System I have exactly the same problem. upgrade to 11.04 then ssh to the university I work won't work any more. both client and server say "connection reset by peer", limiting the cipher length have it work. Details ares here :
http://schplurtz.free.fr/wiki/envrac/reseau-bizbiz-ssh Solution : The Intrusion Detection System detects one of the TCP packets as : Malformed Key exchange init Message - SSH protocol violation and then it sends two reset packets to both the client and server. each of them then says : "connection reset by peer" The security man removed the rule on the IDS, and then ssh works again ! magic. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/708493 Title: cannot login anymore: Read from socket failed: Connection reset by peer -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
