Resolving Azure AD Connect Entra ID Sync Error in Windows Server 2025-2016

Professor Robert McMillen shows you how to fix the Azure AD connect service when it says it closed the connection or an error occurred while sending request. It is due to TLS 1.2 enforcement from an update.
It can also happen when running certain PowerShell scripts such as installing Docker. The log files are not super helpful, but these registry changes will fix you up. It is from MS documentation, but hard to find. Follow along in the video if you are unsure what to do with these changes.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v2.0.50727]

"SystemDefaultTlsVersions" = dword:00000001

"SchUseStrongCrypto" = dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]

"SystemDefaultTlsVersions" = dword:00000001

"SchUseStrongCrypto" = dword:00000001