I'm wondering if anyone has ever seen this issue before.  It's new to me.

A client of mine is experiencing extremely high conferencing session failures in Lync.  Once looking into the conferences in question, it looks as though one specific users conferences are in question.  A conference session for this users Lync meetings are attempting to be joined EVERY 3 minutes, 24 Hours a day with a Response Code of 486 and a Diagnostic Code of 34007.  Here is a ScreenShot of 10 Minutes worth of these attempts:

This user is not experiencing any problems in joining meetings on his own and he is the only user listed as having unexpected conference failures. 

My thought was to restart the AV Conferencing Service or reboot the Front End Servers but wanted to run this past some other first. 

Any thoughts?

UPDATE:

It seems as though it was a hung up process with the AVCMU Agent on one of the Front-End servers.  A simple reboot over the weekend took care of the problem.

Hello John,

I am also seeing same issue with one of our user.

However no services RTCAVMCU hung on any FE. 

How did you resolve this issue?

How did find that AVMCU agent is hung..

Regards

Balu Ilag