There doesn't appear to be any resource contention, the server has 40 cores/80 threads, and 512GB memory and is not virtualized (Windows Server 2022 is running on bare metal). There appears to be no correlation with any time of day. It can happen for the first person to connect or the 30th to connect simultaneously. There is also no correlation with the number of users connected. Some users don't experience the issue for days, but then suddenly get a black screen (myself included). Some users experience it, but then the issue goes away. There appears to be no correlation with any specific users. Most users are able to login without issue, but seemingly random users at seemingly random times will experience the issue and retry ~2-6 times, getting black screens from the RDS client until eventually the session starts normally (with graphics and not a black screen). This occurs with the standard windows client, "Remote Desktop Connection" (mstsc.exe) in addition to "Remote Desktop Connection Manager" (rdcman.exe, from SysInternals) and even FreeRDP. Users frequently report that when they connect, they will see a black screen and the mouse cursor, but nothing else. I've recently setup RDS on Windows Server 2022 Standard Edition.
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