Question : Unable to ping server

I have this weird problem with a 2003 server. I'm not able to ping teither by IP Address or server name the server from computer A but I can ping computer A from the server. The server is a file server and I'm able to connect to all the shares from computer A. The server is also running an ISA server  and the computers are using it as a proxy server and since the computers can not find the server to use it as gateway, they are not able to connect to the internet.

Can anybody help me with this problem

Answer : Unable to ping server

your catalog.Engine is trying to open a port. 50000 range is too high.
Try changing it to 4000