A fatal error occurred while creating a TLS client credential. The internal error state is 10013
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