> 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/troubleshooting/difficulty-with-internet-activ-2.md).

# Transport Layer Security (TLS)

Whether Microsoft's retirement of TLS 1.0 and 1.1 affects ENERCALC's internet activation system.

## With Microsoft’s impending retirement of TLS 1.0 and TLS 1.1 on October 15, 2020, will there be any issues related to TLS 1.0 and/or TLS 1.1?

This retirement applies to Office365, which our software does not interface with locally or over the internet. Our internet-based activation system supports TLS 1.2 as long as you are on build 10.19.1.26 or later - but Office is not involved.


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