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Unable to connect over RDP and IPSEC-VPN to a specific host

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Last Modified: 2013-11-21
Hi all,
Strange problem:

Client laptop "A" connects to the Internet over a cellular modem.
It then opens an IPSEC-VPN tunnel to the office network, over which he can now RDP to computer "X" and to computer "Y".

Client laptop "B" connects to the Internet over a cellular modem.
It then opens an IPSEC-VPN tunnel to the office network, over which he can now RDP to computer "X" BUT NOT to computer "Y".

When laptop "B" tries to RDP to computer "Y" over the VPN, the RDP client opens (with a black screen) and after about 30 seconds pops the message "Your Remote Desktop session has ended. The connection to the remote computer was lost, possibly due to network connectivity problems. Try connecting to the remote computer again..." - no username/password login screen is displayed.

Both laptos are Thinkpads with fully patched WinXP Pro SP3.
Computer "X" they are connecting to is a Windows 2003 Server and computer "Y" is a WinXP Pro SP3 desktop.
The Firewall is Fortigate and the IPSec client is FortiClient.

Any ideas?

Assaf
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