Cupertino playback issue

Hi there, I have a strange issue and would like to ask you for ideas or if anybody experienced that too.

For uknown reason, certain computers are not able to play any stream from our Wowza server. The issue does not depend on ISP. Not sure if it depends on specific client OS configuration but I can say that one organization reports about 90% of computers not being able to play. It also does not depend on browser used.

Browser console shows that it always download just manifest file but no chunks download ever starts.

On server side there is client connect registered in log but no play and stop events occur.:

INFO	cupertino	connect	26.10.2020	8:26:13	89.29.49.30	1386456501	Chrome/86.0.4240.111 Safari/537.36 Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) 	-	0	0	384259.664	livestream-test	-	0	-	https://some.webpage/	1386456501	-			
INFO	stream	create	26.10.2020	8:26:13	89.29.49.30	1386456501	Chrome/86.0.4240.111 Safari/537.36 Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) 	-	0	0	0.0	livestream-test	3024	0	0	https://some.webpage/	livestream-test	-			
INFO	stream	destroy	26.10.2020	8:26:38	89.29.49.30	1386456501	Chrome/86.0.4240.111 Safari/537.36 Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) 	-	0	669	25.307	livestream-test	3024	0	0	https://some.webpage/	livestream-test	-			
INFO	cupertino	disconnect	26.10.2020	8:26:38	89.29.49.30	1386456501	Chrome/86.0.4240.111 Safari/537.36 Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) 	-	0	669	384284.971	livestream-test	-	0	-	https://some.webpage/	1386456501	-			

Any ideas?

When you say Cupertino, do you mean HLS or Low Latency HLS (LL-HLS)?

We’ll need a support ticket to investigate how you have the chunks configured regardless, it is not creating them and could be a configuration error in segment length or buffer settings. We’ll need full access to your code and logs to determine the cause.