I have a Synology NAS server which has been acting as a VPN server using OpenVPN for a couple of years and it works fine. I am a Virgin Media Broadband customer.
A friend of mine has been successfully connecting to the VPN from his Virgin Media Internet for over a year.
This suddenly, it stopped working about 2 weeks ago.
I am able to connect to it from other Internet connections as long as they are not Virgin Media. I tested this in other family members houses who are also Virgin Media customers and this does not work.
So, it appears that Virgin Media has somehow blocked outbound OpenVPN connections from working.
Does anyone know how this can be fixed or is anyone from Virgin able to read this and put a request in to get it fixed (I know, small miracle!).
A possible solution might be to turn the shub into modem mode an use a new router? I use OpenVPN with the shub in modem mode and a Netgear R8000 router. It all works fine though I have not tried it on a NAS.
I have VM using SH2, and regularly use OpenVPN for both Outbound to remote servers, plus Inbound to my own server from other networks. Both work without issue. Outbound requires zero configuration on the SH2. Inbound simply requires me to forward the OpenVPN Port to my internal server.