We have been seeing high numbers of user connection failures in Director since XenApp 7.15 LTSR. We've upgraded to CVAD 1912 CU6 and are still seeing this. We've completely rebuilt new machines on Windows Server 2019 on the control plane. All that is still on Windows Server 2012 R2 are the VDAs and we're in the process of upgrading / rebuilding those. I've checked the settings on the load balancer, storefront, DDCs, and VDAs and can't find anything. I do see a lot of errors and warnings in the Storefront Citrix Delivery Services logs. I have had multiple cases open with Citrix on this and we've tried to collect CDF traces for them. I now have two more cases open now because our connection error count has been randomly going through the roof lately (over 1200 per hour one day this past week). I have session reliability enabled and I don't know what the users will experience if I turn it off, but Citrix documentation definitely says to leave it on. Storefront LBVIP is using SOURCEIP with the same timeout set in Storefront for session timeout. We captured CDF traces on the Storefront servers that are being reviewed for the connection error issue and from the DDCs for the VDA unregistering issue as well in the other case. Another issue we seem to keep having related to this is random VDAs will start having very poor performance even with low session counts at the time. On the Storefront servers, there are warnings and errors all over the place but there doesn't seem to be much information on them I can find.
Our users don't report having to launch multiple times as they've become accustomed to just doing that. When we call to ask, they don't remember by then what happened or even if they noticed anything at the time Director indicated. Is there anything the community might be able to help with this as I'm waiting on Citrix? What information can I provide if so?
