Running MITM attack detected via SSDP

[SDuesterhaupt]

Community... I need your support, please.

Users of my ejabberd instance can no longer log into their account with the following note (translated DE > EN):

We can’t connect to your account. Please check your username and password and make sure you are connected to the internet.

Technical error message: A running MITM attack has been detected via SSDP, authentication aborted and account disabled to limit the damage. You should try to reactivate your account as soon as you are back in a secure network environment.

I do not own an iPhone, but the server side meets all requirements. The interaction between ejabberd and Monal worked until just before Christmas 2024.

What am I missing?

iPhone 16, iOS 18.0.1

Thank you.

[SDuesterhaupt]

Well, I have just found the problem description at processone/ejabberd#4331.

Solved. Thank you.