Pihole: Certifikate Error from router ONLY at home (in the LAN)
reddit / selfhosted

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nerdwithoutattitude · 2023-11-13 14:09

After installing and configuring pihole, I can no longer reach my
self-hosted stuff when I'm on my LAN and using the corresponding
subdomain that redirects to the service via reverse proxy.

Outside the LAN everything works fine and even if I use the IP
(192.16.8.X.X). I have now simply specified the local IPs for the
stationary devices, but this is of course not a workaround for the
mobile devices.

So somehow there is a problem between my router and the reverse proxy.

Both services run on different devices (with different IPs).

The error message I'm getting is a trust/certificate problem with my
router, which I've never had before, as there is a redirect that leads
to the clients with SSL certificates.

Unfortunately, my router - a FritzBox - does not have an SSL
certificate (the lab firmware is not available for my cable router).

Can I change something in pihole, nginx proxy manager or the fritzBox
to avoid this error?

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GenerlAce · 2023-11-13 17:56

I’m not 100% sure if this fits what happened in Your case.  But my
personal issue when using my subdomain in LAN was that I didn’t have
“hairpin-NAT” setup on my router. Once I got my router configured with
hairpin to point to the server, all subdomains worked from both local
and remote.