One thing I have done successfully to get through a firewall is to set up one Radmin server on port 80 on a little old Pentium 166 machine (without a web server of course). Then I can get to that and use it as a proxy (great Radmin feature) to access others internal on standard Radmin ports. I later persuaded firewall control to open up the default VNC ports (they can see the source and are less paronoid about that) and of course you can then use Radmin on those ports.
Post 22 (secure shell) or 20 (ftp data) are also suited and allowed by most proxies. Andbecause they're mainly used for binary data een content fltering proxies (such as Novell bordermanager) can't block it.
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