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Source: LS Conferencing Announcement ServiceĬonferencing Announcement Service could not negotiate TLS and failed to establish a SIP connection. These errors could also be seen in the Lync event logs on each Front End: Log Name: Lync Server All servers were running the latest CU and all certificates were valid for 2 years. This is quite a large Pool with 7 Front Ends and each Front End would periodically generate the above errors in SCOM. Strangely, no users had reported issues and initial thoughts were performance problems with the Lync Front End servers. Local Machine name: FE hostname: IP address: 10.10.10.13:5061 Message: TLS Negotiation took too long to complete

Last modified time: 11:35:24 AM Alert description: Lync Server IM MCU failed to connect to the SIP Front End. Source: LS Instant Message Conferencing Component > .TLSException: TLS Negotiation took too long to completeĪlert: Lync Server IM MCU failed to connect to the SIP Front End. :Operation failed because the network connection was not available. Last modified time: 11:01:50 AM Alert description: Conferencing Attendant failed to join the conference. Source: LS Conferencing Auto Attendant Component The SCOM errors were as follows: Alert: Conferencing Attendant failed to join the conference. I recently came across an issue with Lync 2013 where SCOM (System Center Operations Manager) was periodically reporting errors with the Conferencing Attendant and IM MCU.