telnet to ssh (port 22)

I'm trying to test a new network configuration, and exposing my ssh port
to the Internet. I'm having a friend of my test both smtp and ssh from
his host. He can telnet to my smtp port just fine, but my ssh port
disconnects on him, like so:

<root@friendshost:/usr/u/friend:1753>$ telnet 123.123.123.12 22
Trying 123.123.123.12...
Connected to 123.123.123.12.
Escape character is '^]'.
Connection closed by foreign host.

I think this is the right thing for ssh to do when contacted by telnet.
My ssh doesn't have any knowledge of the other host's keys.

Your thoughts?

Thanks....


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