I have an SBS 2008 installation with VPN enabled. Port 1723 on the router is forwarding to SBS. In Windows XP I have setup a VPN connection and connected using my domain credentials. However neither end can ping each other.

I tried disabling the SBS firewall but to no avail.

Does anyone know what could be causing this?


Check routing table on your XP client

  • I tried setting up the same VPN connection (PPTP) on my iPhone. It authenticates and says it's connected but still can't access anything. – Reado Dec 4 '10 at 17:29
  • So (as you can access clients from server) seems you have problems with routing on clients... Looks like your packets for server goes through your client's default network gateway, not through tunnel. – Sergey Dec 4 '10 at 17:34
  • Sorry I got the ping bit wrong... SBS cannot ping the client. So when the VPN is connected, neither end can ping each other. Any ideas? – Reado Dec 4 '10 at 18:52

Turns out my local subnet had something to do with it. Was using The remote subnet (of SBS) was

When I changed my local subnet to, everything worked as expected. Now I can use VPN via Windows XP and my iPhone.


note: If you would've just changed your original subnet mask from to or you would've resolved this as well.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.