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Strange VPN connection issue

K M

We recently started having a strange VPN connection issue.  Our users can successfully connect to the VPN (we use the Sophos client and an XG Firewall) with no issues.  Once connected they can ping their desktop computer, but as soon as you try to connect a RDP session, the pings drop and the RDP link fails.  After about 30 seconds or so, RDP pops up the failed to connect message and the pings resume.

I tried this on a known good computer that was working with VPN and RDP just a few days ago and encountered the same thing.  There have been no recent changes to the firewall or computers (other than things like definition updates).  RDP works internally and when I connect the VPN I can access other resources (AD, file shares, etc).

I checked the firewall and IPS logs, but nothing stands out.  Any thoughts on where to begin?



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  • 0 in reply to K M

    Thank you for the info.  This proves it is a UDP issue within the XG firewall as TCP RDP connections are not affected.  By forcing RDP to use TCP you lose the advantages of UDP.  RDP uses both UDP (Primary) and TCP to transmit data up to 8 time faster then TCP alone.  I guess if the users have fast Internet connections and they don't notice a difference in speed that is good workaround but Sophos needs to look at this issue and fix it.  We should not have to downgrade our PCs to get it to work with their firewall.

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