Remote SSH user always gets "connection closed"

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http://unix.stackexchange.com – I've tried service sshd restart, I've added sshd:all:allow to my /etc/allow.hosts and the remote user tried rm ~/.ssh/known_hosts. I also checked the logs: cat /var/logs/secure | grep ssh and it says Accepted password for $user from ... This is the first time this particular user has tried connecting but other users have successfully connected to my machine for several days. None of this has worked or pointed me to the error. Any ideas? Edit: I SSH-d into his machine to see if I could get an error log or something by SSH-ing back to me. If I use ssh -vvv $host I get various messages, (HowTos)