Not able to add new Internet Site Server to CEM Gateway

Products

• IT Management Suite

Issue/Introduction

Getting an error when trying to add a new Internet Site Server to the CEM Gateway:

 Failed to validate Server Certificate

Environment

ITMS 8.x

Cause

Gateway is not able to communicate with Site Server due to a TLS mismatch. 

Resolution

Enabling TLS 1.2 on the Site Server and Internet Gateway resolved this issue.

Additional Information

The client and server cannot communicate. TLS version mismatch. Error: The client and server cannot communicate, because they do not possess a common algorithm (0x80090331)