I've run into a problem with ssh that has me completely stumped (and our department IT guy as well): Up until a few days ago I had no problems accessing my files on our departmental server (university math department, running Scientific Linux) using SSH from my Ubuntu box at home, and I had no problems mounting my user directory at work as a network drive.
As of a couple of days ago, running
ssh firstname.lastname@example.org returns
ssh_exchange_identification: Connection closed by remote host Running ssh -v hostname.tld returns OpenSSH_6.1p1 Debian-4, OpenSSL 1.0.1c 10 May 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to gorilla.math.uwo.ca [220.127.116.11] port 22. debug1: Connection established. debug1: identity file /home/sean/.ssh/id_rsa type -1 debug1: identity file /home/sean/.ssh/id_rsa-cert type -1 debug1: identity file /home/sean/.ssh/id_dsa type -1 debug1: identity file /home/sean/.ssh/id_dsa-cert type -1 debug1: identity file /home/sean/.ssh/id_ecdsa type -1 debug1: identity file /home/sean/.ssh/id_ecdsa-cert type -1 ssh_exchange_identification: Connection closed by remote host
and trying to mount the network folder gives
Oops! Something went wrong. Unhandled error message: SSH program unexpectedly exited
In fact I'm not even able to successfully ping the server.
My first thought was that either the server was down, or I had some sort of incorrect firewall setting (although I had not made any changes to the firewall or router). It's not a problem connecting via SSH through my router/firewall though, since I can connect to other servers via SSH (I still have access to my account on the server at my last department), and the server I want to connect to is still up, since I can connect as follows: 1. SSH into old server. 2. From old server, SSH into new server.
However, I can't log into the new server directly. I'm completely stumped. Any ideas?