Can't access JF when on a VPN?

[4r5hw45twh]

It really isn't that complicated to get this to work.  There has to be something you aren't mentioning.

CF subdomain CNAME -> CF domain A/AAAA record for public WAN IP -> router port forwards https 443 -> Caddy -> jellyfin 8096

Things that can break this:
- Misconfigured DNS/adblocker/pihole
- Incorrect public IP
- CGNAT
- VPN not configured to split tunnel
- Misconfigured default route
- Incomplete IPv6 setup.  ISP, router, host, jellyfin all need to support IPv6 and have it enabled.

Yeah, that's how I have it setup. Which works fine, until I try connecting to the server while on VPN network on other devices.

My server PC is on VPN with a specific IP. My mobile devices are connected to a dedicated WiFi network that's also on its own VPN IP/server. When I'm not connected to my VPN WiFi network, I can connect fine. Acts the same even when my server PC has VPN turned off. Same if Split Tunneling is on/off

[TheDreadPirate]

For testing, can you turn off proxying on your domain? I know you set the CNAME for the jellyfin subdomain to DNS only, but I want to verify there isn't something else going on. I know that CF can block known VPN exit nodes so I want to be absolutely certain this isn't a factor by switching everything to DNS only across the board.

---

The other possibility is NetShield, built into ProtonVPN. Is PVPN blocking your domain or something?

[4r5hw45twh]

For testing, can you turn off proxying on your domain?  I know you set the CNAME for the jellyfin subdomain to DNS only, but I want to verify there isn't something else going on.  I know that CF can block known VPN exit nodes so I want to be absolutely certain this isn't a factor by switching everything to DNS only across the board.

---

The other possibility is NetShield, built into ProtonVPN.  Is PVPN blocking your domain or something?

I always have NetShield disabled and my domain is already DNS-only. Like I said, even when my server VPN is turned off, the same issue happens (if connecting on my devices that are also using a separate VPN)

[TheDreadPirate]

I was referring to the client side VPN. Whether they are connected to the WIFI VPN or on cellular with ProtonVPN turned on.

Regardless, I don't have enough information to direct my questioning further.

[4r5hw45twh]

I was referring to the client side VPN.  Whether they are connected to the WIFI VPN or on cellular with ProtonVPN turned on.

Regardless, I don't have enough information to direct my questioning further.

I have my VPN off when on cellular. But if you're saying to turn it on while on cellular and try it, I can.

Side note: nothing changed on my server at all and I couldn't access my JF server even on a regular cellular network (which always was fine). I remember this happening with NGINX too when I got it to work one time. Troubleshooting didn't fix it so I restarted the server and now it works again. Why does this stuff only keep happening with JF specifically?

EDIT: A random VPN server I tried on cellular still allowed me to connect, but not the VPN on my home network (same provider).