"You've left the call" when joining external web conferences (e.g. SfB online)

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Contributor

Hi,
A customer has a problem if he participates in external meetings (e.g. SfB Online) via the SfB Client. If he activates audio/video, he will leave the meeting after a short time ("You have left the meeting"). The employees can be in the internal network or in the Internet, the result is identical.

 

Environment:
Skype for Business 2015 environment with 1x FE Standard, 1x Edge, 1x WAC, 1x Reverse Proxy (NetScaler)

What did I check?
- Firewall rules look fine (https://docs.microsoft.com/de-de/skypeforbusiness/plan-your-deployment/edge-server-deployments/edge-...)
- With OCSLogging I didn't see anything really helpful with the Case AudioVideoConference (is it the right one for that case?)
- Different constellations
- Wireshark and Fiddler - I could not recognize anything

Any unusual features during the tests:
- 504 Timeout message

sfb1.png
- 504 Service unavaible message
sfb2.png
- In some constellations it works
o It always worked in the test via a WAN set up via my mobile phone
o Internally it worked from time to time when I clicked "retry/rejoin"

 

 

Do you have any idea what could be wrong with that? When I think of the error scheme, I'm somehow thinking of a firewall topic, but I can't specify it more precisely.

 

How can I narrow it down? Is there a better ocslogging scenario or other possibilities (e.g. on the client)?

 

Thanks in advance

Patrick

2 Replies
You could take a look at client logs with snooper:

http://msexchangeguru.com/2018/03/26/snooper/


Sounds like firewall to me too. What happens if they join as a guest?
Any difrence between Skype online or Skype on-prem external meetings?

You can check Skype online connectivity with this tool:
https://www.microsoft.com/en-us/download/details.aspx?id=53885

Hi,

The only errors I see are the both from the screenshot - but I don't know if they are relevant for that issue?

 

In the Client-UccApilog I see an ICEWarn=0x40023e0 - don't know I that one is relevant for that issue?

 

Any ideas left? :)

 

Kind regards
Patrick