I was having problems upgrading both openssh-client and openssh-server on Debian Squeeze, after finding that both packages had a status of 'ic'. I found that both /usr/bin/ssh and /usr/sbin/sshd had a few attributes set, then were causing the upgrades to fail per this post. Here is a quick run-down from the post:
74 lsattr /usr/bin/ssh
75 chattr -i /usr/bin/ssh
76 chattr -a /usr/bin/ssh
77 lsattr /usr/sbin/sshd
78 chattr -i /usr/sbin/sshd
79 chattr -a /usr/sbin/sshd
The symptoms of that lead to my discovery were:
bash: scp: command not found
lost connection
when trying to scp some files to the server. And, then the following errors were found in /var/log/auth.log on the server:
Feb 23 09:54:04 host sshd[20432]: error: Bad prime description in line 185
Feb 23 09:54:04 host sshd[20432]: error: Bad prime description in line 186
Feb 23 09:54:04 host sshd[20432]: error: Bad prime description in line 187
Feb 23 09:54:04 host sshd[20432]: error: Bad prime description in line 188
Feb 23 09:54:04 host sshd[20432]: error: Bad prime description in line 189
Feb 23 09:54:04 host sshd[20432]: error: Bad prime description in line 190
which were caused by someone trying to start an SSH session.
It seems like an old bug, so not sure how we were still suffering from it...
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