I have several site to site VPN tunnels set up between a RV042 and several Vigor2820 routers at remote sites.
I also have a web application running on a Server in the home office site.
On the RV042 all web traffic is forwarded to the internal LAN IP of the PC hosting the web App.
External users can get to the web app be entering the external IP of the home office site.
At site one I have a Vigor2820n and a site to site VPN tunnel set up with the home office RV042, with this connected users can access the web app either via the external IP of the home office site or the internal IP of the host Server since it is connected through the VPN. This works how it should.
At site two I have a Vigor2820 (slightly older version) when I connect the site to site VPN tunnel users can no longer connect to the web app using the external IP but can connect using the internal IP via the VPN, if I disable the tunnel the user can connect to the web app using the external address again.
I have thought about updating the firmware on the older Vigor2820 but it is at a remote site so not too keen do to this until I am back there.
Does anyone have any ideas what might be causing the issue.