KB367853370: Licensing - Exception: Could not connect to activation server

Summary

When you activate or de-activate an Esko license on a Local License Manager or a Network License Manager, you get the following error:

Exception: Could not connect to activation server.

Internal Error Message: Error 35: Unknown SSL protocol error in connection to licensingservices.esko.com:443

or
Exception: Could not connect to activation server.
Internal Error Message: Error occurred in transport

Solution

To troubleshoot this issue, you can choose between following options:

• Upgrade of License Manager
  - Upgrade your Local or Network License Manager to a higher version (at least version 16.0.0). You can find these in the "Archived" section on mysoftware.esko.com 
  - Activate/de-activate the license again
  
  
• Offline activation
  - Go to https://www.esko.com/en/support/downloadsandlicenses/activation 
  - Follow the offline activation flow