IP Cam Talk

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Problems with WAN Access

Hey everyone,

for quite a while Ive been successfully using this setup:
- Camera Site: Blue Iris Server behind a Unifi USG behind a LTE Router (no public IP).
- Site 2 (Home): Double NAT DSL static WAN IP (USG behind a Fritzbox DSL Router)

Blue Iris Server permanently tunnels (Windows L2TP) to the USG on Site 2.

This setup was working well until a week ago. Now I suddenly cant connect with the blue iris app or via browser to the UI3 Server. While being in the same LAN as the BI Server everything works fine. Also the VPN Tunnel still connects properly and the BI Server gets the correct static WAN IP.

I just cant see the issue... Any suggestions? Would be much appreciated!