Unable to ping server from client B but able to ping from client A. Please help

Question

This is not really a programming question, but I am at my wit's end ...

I am trying to configure a IIS 6.0/Windows Server 2003 web server with a ASP.net application.

When I try to ping the server from client computer A I get the following:

PING 74.208.192.xxx ==> Ping fails
PING 74.208.192.xxx:80 ==> Ping succeeds!

From client computer B, BOTH the pings fail.

    PING 74.208.192.xxx ==> Ping fails
    PING 74.208.192.xxx:80 ==> Ping fails with a message 
"Ping request could not find host 74.208.192.xxx:80"

Both clients A and B are on the same subnet. The server is outside (a virtual server hosted by an ISP)

I have an ASP.NET application in a virtual directory on the server. In IE or firefox, if I enter http://74.208.192.xxx/subdir/subdir/../Default.aspx, it works from both the clients!

The server has default firewall settings but web server enabled (Port 80 is open).

Answer 1

Isn't this better suited for serverfault?

As long as the web app is working fine, why are you "at your wit's end" over ping? Why do you need it?

You don't "ping" a port; ports are abstractions in TCP and UDP, but not present in ICMP, the protocol used by ping; so I have no idea how PING 74.208.192.xxx:80 "succeeds". Could you post a text log of what you see on-screen?

Check to see if the server is blocking ICMP, you'll have to fiddle with firewall settings in Windows to check this.

Also, make sure you can ping from both computers (A and B) to an external, known-good host (I recommend pinging yahoo.com) to see if a local firewall isn't blocking your pings.