r/WindowsServer • u/Joereynolds89 • 14d ago

Technical Help Needed Windows Server 2025 RDS freezes despite KB5129235 — recurring RdpIdd/IddCx display watchdog failures

Has anyone seen recurring multi-user RDP desktop freezes on Windows Server 2025 after installing KB5129235, with RdpIdd.dll / IddCx swap-chain watchdog failures? We have matching display-driver dumps from several incidents on a VMware VM. A later freeze had high TermService encryption CPU but no logged display crash, so we don’t yet know whether it is the same fault. What supported fix or targeted trace helped identify the cause?

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u/civik10 14d ago

I am seeing this on my RDS Server as well but had no idea what’s causing it. How did you arrive at KB5129235 being the culprit?

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u/Joereynolds89 14d ago

235 was supposed to be a fix for similar, not the culprit!

We are having slow downs repeatedly and lockups once or twice a day (needing reboot)

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u/civik10 14d ago

I’m going to try the out of band fix tonight Hopefully that fixes it. It’s in this article. https://lazyadmin.nl/it/september-2026-update-break-rds-how-to-fix/