Lync 2013 conferencing – An error has occurred


Windows Server 2012 R2

Lync Server 2013


Client called with an issue of users complaining that any conference they join scheduled or ad-hoc are failing, with a generic message or “An error has occurred”


We opened the Event Viewer and found that it was riddled with errors

  • Event ID 32042 LS User Services
    Invalid incoming HTTPS certificate
    cause: This can happen if the HTTPS certificate has expired or is untrusted
  • Event ID 32042 LS User Services
    Sending HTTPS request failed. Server functionality will be affected if messages are failing consistently. Sending the message to

We went through this MS Support article however it didn’t work for us.

Opened up the certificate MMC to check our certificates , Start -> Certlm.msc

  • Local Store -> Personal
    • all certificates were valid
  • Local Store -> Trust Root Certification Authority
    • all root certificates were valid
    • however there were intermediate certificates included in the list
  • Local Store -> Intermediate Certification Authority
    • all certificates were valid

I proceeded to remove the Intermediate certs from the Trusted root store and rebooted the Lync Server 2013 and the errors went away and clients were now able to connect to conferences.

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