SBS 2008 VPN - Cannot communicate with clients over VPN

Here's a snippet of my network configuration:

OFFICE
- Server: 10.1.1.2 (SBS 2008)
- Workstation: 10.1.1.10 (W7)

HOME
- Workstation: 192.168.1.10 (W7)

In SBS Console, I've enabled VPN and added myself to the VPN users group. The HOME workstation has successfully connected to SBS at the OFFICE via VPN.

However SBS cannot ping the workstation at HOME, but it works the other way round. Additionally neither workstations can ping eachother. DNS requests from HOME resolve fine.

Ultimately this means I can't connect to any internal devices over the VPN, such as RDP.

Any idea what could be causing this to fail?
reado83Asked:
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reado83Connect With a Mentor Author Commented:
I have managed to resolve it by disabling IPv4 Checksum Offload on the network adapter in Device Manager. For some reason this was blocking the VPN traffic only.
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Larry Struckmeyer MVPCommented:
I hate to be like this, but I do have to ask why you would want to do this?  SBS 2008 provides both RDGateway and Remote Web Access, both of which are vastly superior in safety and performance to VPN.  I cannot recommend VPN to any SBS network unless there is some outstanding reason for not using RWA.

Having said that, can you explain the goal?  For example, if you forward port 3389 from the firewall/edge device to the SBS you can RDP directly without a VPN, then RDP to any station on the network.  But I would not do that unless you restrict port 3389 to your home IP.
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reado83Author Commented:
I have managed to resolve it by disabling IPv4 Checksum Offload on the network adapter in Device Manager. For some reason this was blocking the VPN traffic only.
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