How can I tell what version of FreeBSD my pfSense version is based on

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Summary

How can I tell which version of FreeBSD was used as a base for a specific version of pfSense?

Solution

The Versions of pfSense and FreeBSD article contains a table of the versions used in various releases, or follow these instructions:

From the Dashboard in the GUI, look at the System Information widget. It is displayed under the Version section. Clicking the FreeBSD version displays the full kernel uname -a output.

In the SSH console or Execute Shell Command field in the GUI, run the following:

uname -mrs