which port does reflection use?

[thebeatlesguru]

i use the software "reflection" to login the HP
server's xwindown, now i can a new office, there is a firewall that deny a lot of port,now i cant use the reflection ,i wanna know the port that the sw use, so i can tell the administrator to open this port on firewall.

[Michael Tully · Accepted solution]

Hi,

Reflection X uses UDP port 177 (XDMCP) and TCP port 6000 for communication.

This article explains I am sure exavtly what you want to do.

http://www.serverworldmagazine.com/monthly/2002/01/reflectionx.shtml

HTH
Michael

[Jeff Schussele]

Hi,

Port 177/UDP is used by XDMCP an X protocol for server discovery
X11-server listens on port 6000+display number/TCP
X11 font server listens on port 7000+display numbe/TCP.
Shared-X uses port 7815/TCP.

X-window protocol is far from the most secure transport around & I suspect your FW admin will put up fierce resistance to opening all X-server/X-window ports for general use w/o accompanying security such as VPN & DES encryption as well as secure authentication to match.
Unsecured X-window is an easy exploit for the mildly capable & deserves a lot of thought, time & expense before opening up to the world.

My 2 cents,
Jeff