24 May 2017

Skype for Business 2015 Frontend Service won't start - Don't disable TLS 1.0 Event ID: 32192 & 32179

Finally figured it out.
Our Skype for Business 2015 Server Front-End service wouldn't start, it kept displaying "Starting".
The event-viewer kept filling up with:
Event ID: 32192

Closing routing group service due to an error.

Calling ReportFault on routing group {3C86EE90-FB81-5FC0-9B41-2C787B4ACC20} with FaultType 2 and ReasonCode 3. Error code: 0x00000000(ERROR_SUCCESS)
Cause: This may indicate a problem with the routing group. Please examine the server event logs and traces to identify the cause.
Run the commandlet Get-CsPoolFabricState -RoutingGroup [ROUTING GROUP] and make sure quorum is achieved. If the Pool is running and the Front-End is just started, this is normal for some time. If the error persists while the Front-End is running, restart the server.

Event ID: 32179

Request to sync data from backup store for routing group {353B9BC5-A12D-578B-BAD5-F7F8BD5E02FC} was throttled due to pending requests.
Cause: This can happen when a Pool is re-started, and should go away automatically.

Turns out TLS 1.0 was disabled but this would be effective after the first reboot.
So when we rebooted for the latest WSUS updates it got activated and thereby killing the RTCSRV.exe service.

You can find the key here:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0|Server
REG_DWORD - Enabled
Value: ffffffff (decimal: 4294967295)

The disabled value is:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0|Server
REG_DWORD - Enabled
Value: 0(decimal: 0)


  1. If I understand this correctly, enabling TLS 1.0 broke Skype for Business 2015? The reason I ask is that we are currently running Lync Server 2013 and would like to disable TLS 1.0 to address some PCI security findings. However, Microsoft has told us that this is not possible in our current version. If upgrading to Skype for Business 2015 would allow us to disable TLS 1.0, I'd love to know!

  2. No you can't disable TLS. In my case tls was disabled in the registry but not rebooted yet, so after the reboot the disable TLS setting became active thus disabeling TLS. If TLS is disabled on Skype (and i guess this goes for Lync as well) that will break the front end service.