PDP (CAC) Errors After Installing SfB 2015 CU4

I noted in my recent post about CU4 that I’d seen a recurrent 32270 error in my Lab after the install, and that it took another reboot to banish.

Roll forward a few weeks to my current customer deployment and I’ve been seeing recurrent PDP (Call Admission Control) errors… since the moment CU4 went on.

These are popping out roughly every 5 minutes:

Event36023-DisconnectedFromServer

Event 36023, LS Bandwidth Policy Service (Core)
 
Disconnected from server.
 
Machine FQDN server1.contoso.com (IP address: 10.10.10.10, TCP listening port: 448, Type: Intracluster) in pool myfepool.contoso.com
Cause: If the specified server is removed from the topology or is currently draining or is stopped, this behavior is expected; otherwise, a network issue may have caused the disconnect.
Resolution:
If this behavior is unexpected, resolve the network issues between the two servers. Ensure that the service is listening on the specified port and FQDN.

Event36022-SuccessfullyEstablishedConnection

Event 36022, LS Bandwidth Policy Service (Core)
 
Successfully established connection to server FQDN server1.contoso.com (IP address: 10.10.10.10, TCP listening port: 448, Type: Intracluster) in pool myfepool.contoso.com.

 

A reboot would have probably fixed it, but I wanted to avoid that across my EE pool, so I tickled the PDP services on all three FEs and the error’s gone.

stop-csWindowsService RTCPDPAuth
stop-csWindowsService RTCPDPCore
start-csWindowsService RTCPDPCore
start-csWindowsService RTCPDPAuth

 

Fixed in CU5

I guess I wasn’t the only one encountering this as it’s been subsequently addressed by a KB in the May 2017 release of CU5:

  • 4020994 Event ID 36023 is consistently logged on Multiple Front-End servers in a Skype for Business Server 2015 environment that enables CAC

Revision History

3rd June 2017: Added “Fixed in CU5”.
 
– Greig.
 

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