When applying a license in Symantec Installation Manager (SIM) the following error is seen:
Symantec Installation Manager detected that TLS1.0 is not enabled on this machine and Microsoft .NET is not configured to support this configuration.
Required configuration steps are specified in TECH272111.
Selected operation can't be initiated.
TLS was improperly configured for the operating system in the registry.
The KB referenced in the message above is actually a legacy Symantec KB number and the new Broadcom KB number for this article is:
172898 Failing to install ITMS. ConfigureNS - task_Completed(): Configuration Task Pre-Configuring ... Failed: The underlying connection was closed: An unexpected error occurred on a send.
The RESOLUTION is to check the following registry keys and verify that they are set correct and then stop & start SIM again. Here's the steps: