Hi, today I had a freeze of freeswitch on a machine running BigBlueButton (which ship their own freeswitch packages: FreeSWITCH Version 1.10.4-dev+git~20200515T214527Z~e1f63ce5b1~64bit (git e1f63ce 2020-05-15 21:45:27Z 64bit)) I had this kind of lockup 3 times in the last 2 months and I tried to track down the cause of the problem but I failed. BigBlueButton uses the conference module for audio switching. All connections come in via a Websocket. In front of the FreeSwitch websocket there is an nginx reverse proxy which says it cannot connect to the upstream (FreeSwitch) server when the lockup occurs. We have setup conference dialin from our Cisco call manager. During the lockup FreeSwitch does not accept connections from the call manager as well. Today no calls from call manager were involved. In the logs I observed that at some time almost all participants of a conference were thrown out and calls terminated with MEDIA_ERROR hangup cause. Participants came from different autonomous systems, I checked that there was no network interruption. CPU usage on the system was below 20%, memory below 40%. The number of participants during start of lockup was 34 distributed across 8 conferences. During the 40 minutes lockup 4 conferences ended, the others continued to switch. FreeSwitch continued to operate as expected after ca 40 Minutes without any operator interactions. Could you please give some advice on how to find the cause of this problem? Thanks alot, Daniel -- Daniel Schreiber Facharbeitsgruppe Systemsoftware Universitaetsrechenzentrum Technische Universität Chemnitz Straße der Nationen 62 (Raum B303) 09111 Chemnitz Germany Tel: +49 371 531 35444 Fax: +49 371 531 835444