Windows Server 2016 freezes when setting up SSTP VPN in RRAS. First the “OK” button stops responding in properties windows inside RRAS. In particular after attaching an SSL Cert in RRAS, the problems start occurring. Then the RRAS services get stuck in a “Starting” state. Then the server becomes very sluggish and starting basic tasks like opening Task Manager hang. Rebooting the server sometimes results in a blue screen.
Uninstall Server 2016 security patch KB4015217 – released April 11, 2017. Following removal, you may need to reboot several more times and remove and reinstall the Remote Access role before the problem is resolved.
Disabling RRAS services and removing the Remote Access role also fix the server slowdown issues.
We spent many hours battling this issue before narrowing the issue down to this bad patch. We have a support case open and the bad patch has been reported to Microsoft’s product development team to fix the broken patch in a future Server 2016 patch.