Peer to Peer problem

[JOHNFDS]

Two computers, an HP desktop & a Toshiba laptop, share this problem. They can
get to the Internet wireless through a Checkpoint firewall appliance/ap and
email is no problem. They cannot see each other for peer to peer file
sharing. Turned off XP's firewall and disabled F-Secure all together but to
difference. As an experiment I connected them with a crossover cable and
assigned IP's but still can ping each other. If I connect my laptop, either
one of them can ping me but I cannot ping either of them. I can find no other
software installed that might explain this. The F-Secure is current and up to
date and runs a daily scan so virus or trojans are unlikely. The HP desktop
has Internet Connection sharing turned on even though the Internet is through
the CheckPoint appliance.
Any ideas anyone?
John.

 

[JOHNFDS]

Did not see Cisco software installed either in "Add/Remove Programs" or in
Start / Programs. Have not checked the directories under Programs Files yet.
The VPN appears to be a site to site VPN from the Checkpoint appliance to
the other side.

John.

 

[JOHNFDS]

No Cisco VPN but there appears to be WinVNC installed. Am unable to launch
WinVNC though attempting to results in various error messages. No sign of it
in the Tsk Manager.

They appear to have a site to site VPN in place. I do not see any
Checkpoint software on the PCs. I could see the Checkpoint box blocking
inbound on the wireless NIC but blocking the wired NIC?

John

 

[John Wunderlich]

No Cisco VPN but there appears to be WinVNC installed. Am unable
to launch WinVNC though attempting to results in various error
messages. No sign of it in the Tsk Manager.

They appear to have a site to site VPN in place. I do not see any
Checkpoint software on the PCs. I could see the Checkpoint box
blocking inbound on the wireless NIC but blocking the wired NIC?

I have no idea what the problem might be.

On the off-chance it might help, you might try running one of the
following tools. Sometimes it helps:

LSPFix: <http://cexx.org/lspfix.htm>
Winsock XP Fix: <http://www.download3k.com/Install-WinSock-XP-Fix.html>

HTH,
John