Forum Discussion

Paul Cannon's avatar
Paul Cannon
Former Employee
Jul 24, 2018

Welcome everyone to the Skype for Business Server 2019 Preview Forum!

I just want to welcome everyone who has read the blog - SfB Server 2019 preview is ready for you to try. Be sure to post ALL your questions, comments, and feedback here.
Krzysztof Sienkiewicz's avatar
Krzysztof Sienkiewicz
Brass Contributor
Apr 18, 2019

Drive_Heart

So, I know more now, after understanding the flow of traffic.

It maybe that there are too many hops between new Skype 2019 pool in US and monitoring DB in Denmark.

To make it simple. User that made a call/received a call is still on Skype 2015, but for all mediation traffic it's Skype 2019 that is the primary pool now:

1. Skype 2019 in US initiates and controls the call until it ends

2. Since user calling/called is still on Skype 2015 in US, it sent the QoE metrics from First 2019 FE to Third 2019 FE in US (Hop 1)

3. Third 2019 FE sends QoE metrics to Second 2015 FE in US (Hop 2)

4. Second 2015 FE in US sends QoE metrics to whichever (don't have logs from this pool) 2015 FE in DK (Hop 3)

5. 2015 FE in DK sends data to Skype 2015 Monitoring DB

Since many calls (tens or hundreds) are happening on the mediation pool, and only few QoE metrics don't get delivered to the monitoring DB, it seems not to be a big issue and might be related to network latency since so many hops are in the path.

 

But the problem described as Nr 1 (with failing connection to backend) and PowerPoint sharing problems (let's call it problem nr 3) in Skype 2019 are still there. Apart from that we noticed another problem in Skype 2019 (let's call it problem nr 4):

4a) It starts with LS Protocol Stack Warning (EventID 14397):

A configured certificate could not be loaded from store. The serial number is attached for reference.
Extended Error Code: 0x80092004(CRYPT_E_NOT_FOUND).
 
4b) it then gets LS Protocol Stack ERROR (EventID 14623):
A serious problem related to certificates is preventing Skype for Business Server from functioning.
Unable to use a certificate as configured.
Transport:TLS, IP address:0.0.0.0, Port:5061, Error:0xC3E93C0D(SIP_E_STACK_TRANSPORT_CERT_NOT_FOUND).
Ensure that a valid certificate is present in the local computer certificate store. Also ensure that the server has sufficient privileges to access the store.
Cause: The Skype for Business Server failed to initialize with the configured certificate.
Resolution:
Review and correct the certificate configuration, then start the service again.
 
4c) then it goes into shutting down the Front End Service with LS Server ERROR (EventID 12303):
The protocol stack reported a critical error: code 0xC3E93C0D (SIP_E_STACK_TRANSPORT_CERT_NOT_FOUND). The service has to stop.
 
4d) it continues with series of few warnings and erros about not being able to open connection to Storage Service (LS Data Collection EventID 56726), and then after 3 minutes it starts working again and service is brought back up, and no more issues connecting to Certificates store.
 
If you think writing all this here in the forum is not right, we could switch to another tool (mail/Skype) so I can describe the issue and we could maybe resolve them)?
  • Krzysztof Sienkiewicz's avatar
    Krzysztof Sienkiewicz
    Brass Contributor
    Apr 19, 2019

    Rohit_Gupta_25 

    For which of my described problems? Cause the one with QoE metrics, like I said, probably too many hops and after investigation it seems to be happening only sporadically, probably will go away when we move users to new Skype pool, if not, I will get back on that. Other problems I described are more of a show-stopper for us (PowerPoint presenting, services going down because Cert Store cannot be opened, etc.)

    • Rohit_Gupta_25's avatar
      Rohit_Gupta_25
      Former Employee
      Apr 19, 2019
      Please post for the showstopper problems, along with detailed repro steps.

Resources