Question : Enabling Remote Desktop w/ Weird Ping Scenario

I'd appreciate any suggestions on how to resolve this:

I have two computers, one running Windows XP and the other Windows 2003 Server. They are both connected to a Linksys BEFSR11 router through a Linksys 4-port switch. Each computer can access the internet and ping the router and any external site with no problems. They cannot ping each other. They do not have firewall software enabled, nor is a firewall enabled though the TCP/IP settings provided by Windows. The XP machine is configured to  be 192.168.1.50 and the Server machine is 192.168.1.100. They have the same subnet mask, 255.255.255.0. The gateway is 192.168.1.1. I have enabled port forwarding on the router to direct port 80 to the Server computer, and it works fine from an external machine (i.e. a webpage is served correctly). My goal is to enable Remote Desktop to allow me to remotely manage the Server computer from the XP machine. I receive the following error:

"The client could not connect to the remote computer.
Remote connections might not be enabled or the computer might be too busy to accept new connections. It is also possible that network problems are preventing your connection.
Please try connecting again later. If the problem continues, contact your adminstrator."

Deliverables:
1) I need to be able to ping the network computers 192.168.1.50 and 192.168.1.100.
2) I need to be able to establish a remote desktop connection between the computers.

This question is worth 125 points.

Thanks in advance!

Answer : Enabling Remote Desktop w/ Weird Ping Scenario

To use RDC, you have to forward port 3389 on the router to the internal machine
>> They are both connected to a Linksys BEFSR11 router
the router is acting like a firewall, due to it is using NAT (network address translation)
connect to each router by using the web interface (http://192.168.1.1 by default)
and brwose thru to where you can forward your ports (the manual shoudl be able to tell you)
for ping, I beleive it's port 7