[cvsnt] if use the cvsssh,which port should be open in Server

[Jimmy]

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Hi,all,i have setup cvsnt and use cvsssh as ssh service,there is a firewall in our host,but i have open port 80,2401,2402.now the problem is that we can access cvsnt server via pserver,but not extssh,why?should we open port 22 in server..
                             thx 
                           jimmy.