Current versions of RetainPro, the activation server is contacted using HTTPS REST API calls over port 443 to Enercalc.net.
(For older versions of RetainPro, the activation server is contacted on port 80 using 18.104.22.168 (www.mykron.com).)
These are not URLs that will display a meaningful web page.
We use this simple connection to get through firewall and anti-virus software. The data sent is an encrypted text string. If the software cannot contact the server, it’s usually because your firewall or anti-virus software does not allow our RP10.EXE program access to the Internet. In rare cases a user will have a proxy server that cannot be automatically located.