PPTP connection but can't ping devices inside of network

I have a WatchGuard v11.5.2 setup in our Scotland office. When I connect via Windows VPN client via PPTP I can connect successfully but I can't ping any devices inside of their network. I think I have everything setup correctly but I must be missing something or it is configured incorrectly.

I have the WG device handing out DHCP addresses for both the internal network and the PPTP. The IP that I am receiving when I connect PPTP is 192.168.15.91 and the IP that I am trying to PING is 192.168.15.10. I know this machine is up because I am connected to if on our office network through the BOVPN tunnel. I can PING the gateway with no problem (192.168.15.1).

I don't see any failures and I can see in the System Manager that I am connected and it is passing packets.

Has anyone else seen this or can you tell me what to look for? Thanks for any help/advise you can offer!
CCG3Sr Systems AdministratorAsked:
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S00007359Connect With a Mentor Cloud Engineering OfficerCommented:
on your pptp connection, is the tcp/ip enabled as use default gateway for remote connections!
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Frosty555Connect With a Mentor Commented:
What is the IP of your outside computer while you're connecting to VPN? The subnet of the connecting PC must be different from the subnet it is VPNing into. E.g. it must NOT be 192.168.15.xxx.

Also, I'm not sure if the WatchGuard device is both the router, AND the VPN server... but if the VPN server is a separate machine then you need to make sure the router and firewall are forwarding / allowing TCP port 1723, and GRE Protocol 47 through.
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CCG3Sr Systems AdministratorAuthor Commented:
WG is both the router and the VPN server. My IP is 192.168.0.x on my local machine.
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CCG3Sr Systems AdministratorAuthor Commented:
No it isnt. But the route entry in the routing table that gets put is correct. And if I do a tracert it goes straight to the gateway, and that us as far as it gets.
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CCG3Sr Systems AdministratorAuthor Commented:
Ok, so I changed the setting on the PPTP connection to use default gateway and it does start working. Problem with this is that it routes all traffic through the Firewall then. Is there anyway I can set the route correctly in WatchGuard to not need this turned on like this?
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CCG3Sr Systems AdministratorAuthor Commented:
This has been open too long. i am guessing there is no answer.
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