UPnP/IGD unable to communicate with IGD at [IPv6 address]

[ottelo9]

The problem

My router doesn't have IPv6 enabled but the integration still tries to communicate with the router at http://[fe80::4a5d:35ff:fe43:1572%2]:49000/igddesc.xml instead of http://192.168.178.1:49000/igddesc.xml which works fine.

I disabled IPv6 in router (Fritzbox) and in HA (+reboot).

There was already a related issue but was closed:
#77989

What version of Home Assistant Core has the issue?

core-2023.10.5

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

UPnP/IGD

Link to integration documentation on our website

https://www.home-assistant.io/integrations/upnp/

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

Config entry 'FRITZ!Box 6890 LTE' for upnp integration not ready yet: Unable to communicate with IGD at: http://[fe80::4a5d:35ff:fe43:1572%2]:49000/igddesc.xml; Retrying in background

Additional information

HA running on rpi4. IPv6 disabled on LAN and WIFI. But network adapter info shows still ipv6 address:

[home-assistant]

Hey there @StevenLooman, mind taking a look at this issue as it has been labeled with an integration (upnp) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of upnp can trigger bot actions by commenting:

• @home-assistant close Closes the issue.
• @home-assistant rename Awesome new title Renames the issue.
• @home-assistant reopen Reopen the issue.
• @home-assistant unassign upnp Removes the current integration label and assignees on the issue, add the integration domain after the command.

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[ottelo9]

[StevenLooman]

Hi @ottelo9, thank you for this issue. Can you enable debug logging as mentioned in the upnp documentation/Debugging integration, and send the logs to me? Either post these here, or mail these me.

My guess is that, although you've disabled IPv6 in your FRITZ!Box, it is still advertising itself over IPv6.

[ottelo9]

Ok thx for your answer. I will do a debug logging. But anyway, it is possible to force IPv4 somehow?

Do I have to restart HA to enable debug logging?

[ottelo9]

@StevenLooman
I sent you a mail with the log files.

[ottelo9]

@StevenLooman
Any news for me?

[StevenLooman]

Hi @ottelo9. Thank you for sending the logs. I am going to look at these now.

[StevenLooman]

This is a problem with the router itself instead of the component. If IPv6 is disabled at the router, then it should not still broadcast itself on IPv6. Please, if you can, report a bug at AVM that if you disable IPv6 on the router, it is still responding with IPv6 related addresses.

Nevertheless, I've created a PR to prefer IPv4 addresses over IPv6 addresses. Hopefully this fixes this problem.

[ottelo9]

I found out that I hadn't turned off ipv6 completely after all. I use a FB 6890 LTE and I have to enable IPv6 support in the internet settings (DSL/WAN). Then I went to the network settings and disable all IPv6. NOW it works :D