问题
Recently deployed a Windows 2016 Standard Server, with Active Directory and Exchange 2016.
We have disabled SSL 1.0, 2.0 and 3.0 for both Server and Client, and have disabled TLS 1.0 and TLS 1.1.
We are repeatedly getting the following entry in our system log. What is causing this, and how can I fix it.
回答1:
Basically we had to enable TLS 1.2 for .NET 4.x. Making this registry changed worked for me, and stopped the event log filling up with the Schannel error.
More information on the answer can be found here
Linked Info Summary
Enable TLS 1.2 at the system (SCHANNEL) level:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client]
"DisabledByDefault"=dword:00000000
"Enabled"=dword:00000001
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server]
"DisabledByDefault"=dword:00000000
"Enabled"=dword:00000001
(equivalent keys are probably also available for other TLS versions)
Tell .NET Framework to use the system TLS versions:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SystemDefaultTlsVersions"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319]
"SystemDefaultTlsVersions"=dword:00000001
This may not be desirable for edge cases where .NET Framework 4.x applications need to have different protocols enabled and disabled than the OS does.
回答2:
This works for PowerShell too - was getting an error from connect-MSOLSservice "An error occurred while sending the request" with the same Event Code.
Applied the reg fix above and solved!
来源：https://stackoverflow.com/questions/53121859/a-fatal-error-occurred-while-creating-a-tls-client-credential-the-internal-erro