"FRITZ! Box Tools"-Integration for a CASCADED Fritzbox-Router?

I don’t know, how to configure “FRITZ! Box Tools”-Integration for a CASCADED Fritzbox-Router.

Home assistant on Raspi5 can be reached from 192.168.178.0 with URL 192.168.178.10:8123.

First I created an entry for “FRITZ! Box Tools”-Integration with my Fritzbox Internetrouter (FB1, IP 192.168.178.1) with follwowing parameters:

  • 192.168.178.1
  • MyUsername
  • MyPassord
    and this works fine.

For my cascaded Fritzbox-router (FB2, IP 192.168.178.2 with local network 192.168.188.0) WAN-port is attached with LAN 1 from FB1.
FB2 (not in Mesh!) is allowed to be accessed from Internet by https port 434 with Admin-User and password from FB2 (for 192.168.178.2 the Internet begins with 192.168.178.0).

From 192.168.178.0 I can login on FB2 with URL https://192.168.178.2:434, FB2-admin and password.

When I want to configure an entry for “FRITZ! Box Tools”-Integration for FB2
with parameters

  • 192.168.178.2
  • 434
  • Admin-User
  • passord
    with checked “Use SSL-Certificate” I got “unexpected error”.

Without checked “Use SSL-Certificate” I got failed login.

So this must have to do with the SSL-Cetificate for FB2.

On FB2 I can generate a certificate box.cer file.
What I have to do with this file and where must the certificate be copied in HA-System?

Would be great, iy anyone can help me.