Unable to activate ManyCam 5 Enterprise

I have an Enterprise license for version 5. Today, I tried to activate a new device, and am getting the following error.

“An unknown error occurred (Network error).”

Does anyone know why the activation fails?

Looking at packet captures, the client is trying to setup a connection to mca.manycam.com and getting a connection reset right at the TLS setup.
Are the activation servers still working?

@Han_Sooloo Please contact support.