> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/sel-faq/setup-and-licensing/installation-activation-lice/how-it-works/connecting-to-the-internet-act.md).

# Connecting to the Internet Activation Server

How ENERCALC SEL connects to the license activation server, including ports and domains for different builds.

## How does the software connect to the activation server?

**FOR SEL BUILDS** **ON OR AFTER 10.19.\*\*\*\*\*\*\*:**

The activation server at [enercalc.net](http://enercalc.net) (not [www.enercalc.net](http://www.enercalc.net)) is contacted on port 443 (HTTPS / SSL) We use this simple connection to get through firewall and anti-virus software. Our software uses standard HTTPS REST API calls to process license activation. If the software cannot contact the server, it’s usually because your firewall or anti-virus software does not allow our `ENERCALC.EXE` program access to the Internet. In rare cases a user will have a proxy server that cannot be automatically located.

**FOR SEL BUILDS** **ON OR BEFORE 10.18.\*\*\*\*\*\*\*:**

The activation server is contacted on port 80 using the IP address 54.88.93.167 for [www.mykron.com](http://www.mykron.com). This is not a URL 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 `EC6.EXE` program access to the Internet. In rare cases a user will have a proxy server that cannot be automatically located.


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