SSL/TLS Handshake Failed


SSL/TLS Handshake Failed

  • Polycom VVX 601
  • Skype for Business Online (Office 365)
  • S/W


Notice yesterday the message "SSL/TLS Handshake Failed".  Tried a couple of reboots and that didn't solve it.


Any thoughts on the cause?


In my own trial and error...


I have now disabled device updates on the Skype for Business Online Management Shell / Configuration File on the handset to allow phones to run on a different version.  Then installed S/W  Phones now seem fine.


So my presumption is...

  1. Microsoft done an update on the O365 servers that now require a different TLS version.
  2. But Microsoft have forgotten that Polycom S/W doesn't support it.
  3. And Microsoft haven't pushed out device updates first


When installing S/W manually, my choice of was from the version qualified in Microsoft's list of certified IP phones https://docs.microsoft.com/en-us/skypeforbusiness/certification/devices-ip-phones#conference-phones.

But then if is the version Microsoft list, why is being pushed out as the  qualified version for Skype for Business Online? 

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