TLS 1.2 Connection Request - Error 36874

Question

Hi, I have a clean install of Server 2019 Standard and have worked through the various errors I was getting. However I am left with one error I cant seem to fix.

The error is:-

Error ID 36874 - An TLS 1.2 connection request was received from a remote client application, but none of the cipher suites supported by the client application are supported by the server. The TLS connection request has failed.

Is it a simple case of enabling TLS 1.2 on my server? If yes, how do I do this?

Secondly, theses errors occur when there are no client PC's turned on e.g. in the early hours of the morning. Is this someone trying to connect remotely to the PC? a hacker?

or finally, should I just ignore this and worry about something else? haha

Any help or guidance would be much appreciated.

Regards,
Cliff

Answer 1

Something here may help.
https://learn.microsoft.com/en-us/windows-server/security/tls/tls-registry-settings#tls-12

--please don't forget to Accept as answer if the reply is helpful--

Answer 2

Based on what you listed four virtual machines minimum

• ADDS, DHCP, DNS
• File and Storage Services, WSUS
• IIS
• Remote Access Some general info on hyper-v licensing
• A minimum of 8 core licenses is required for each physical processor and a minimum of 16 core licenses is required for each server.
• Core licenses are sold in packs of two.
• Standard Edition provides rights for up to 2 Operating System Environments or Windows Servers containers with Hyper-V isolation when all physical cores in the server are licensed. For each additional 1 or 2 VMs, all the physical cores in the server must be licensed again.
• DataCenter Edition provides rights for unlimited Operating System Environments or Windows Servers containers with Hyper-V isolation when all physical cores in the server are licensed.
• AVMA keys can be used only when the host is DataCenter edition

https://download.microsoft.com/download/7/C/E/7CED6910-C7B2-4196-8C55-208EE0B427E2/Windows_Server_2019_licensing_datasheet_EN_US.pdf

Answer 3

@Anonymous
So I have verified that I have only TLS 1.2 enabled on my Exchange servers but I am getting the Event ID 36874 for SCHANNEL. I have downloaded and tried using the Process Monitor but still struggling to find the client that could be causing this error. Any clues on how to narrow this down would be great. Thanks.