Yes, unfortunately the wifi is not good at FOSDEM and completetly at its limits. but in the morning, when few people were there, we managed to have sucessfull calls.
Lauschangriff auf russischen Jabber-Server in Deutschland: Wer steckt dahinter?
Rein zufällig flog auf, dass sich Unbekannte mit einem eigenen Zertifikat in Jabber-Chat-Verbindungen einklinkten. Die Betreiber vermuten eine Polizeiaktion.
To reduce the risk of such attacks in the future an early stage service called CertWatch has been published by our Community: https://certwatch.xmpp.net/