[NTLUG:Discuss] port 22 "filtered"

[terry]

cannot ssh to a (Fedora core1) PC, even though sshd IS running on that 
machine, and 'ssh localhost' DOES work [on that target machine].

nmap (from outside) reports port 22 is "filtered"
(I have to run nmap with -P0 option)
ie. nmap -P0 -p22  **.***.**.***
Port       State       Service
22/tcp     filtered    ssh

So, how do I un-filter port 22 ?

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