I asked this question over in the router discussion group but haven't received a response so I'll try here.
I have a set of SPA942 phones that are located in a remote network. Previously, I would open up ports on the internet router for this network so that I could access the web admin pages for these phones from across the internet. On the web admin pages, I could modify the settings for these phones and then click "Submit all changes" and successfully have these changes updated into the phone.
Now, this remote network has been upgraded with a RV042 router so that it can connect to the main office via a VPN tunnel. I still need to access the SPA942's web admin pages so I have set up a QuickVPN client VPN connection to gain access to this network. Via QuickVPN, I can access each of the SPA942's web admin pages and browse through the pages, but whenever I update a value and press "Submit all changes", the page will revert back to show the previous, unmodified value. In other words, I can't get my changes to be accepted by the SPA942.
As a test, I port-forwarded a port on the RV042 to point to the SPA942. From across the internet I connected to this exposed port and got access to the SPA942's web admin page. With this method, I could successfully modify and save changes to the SPA942.
So it seems that there is something about the VPN connection that is preventing me from saving changes to the SPA942. Has anybody come across anything like this before? Any idea of what could be happening here?