Unable to save administration changes

[walkerx]

I recently upgraded to 21.7 and if I try to make a change on the administration page and save it, i get the following error

The following input errors were detected:
Certificate Web GUI SSL certificate is not intended for server use.

Even if I try switching to HTTP connection I get the same error. I've never installed a certificate and use the defaults applied when installing the system.

When looking at the certificate it says CA: Yes, Server: No and the dates for validity is mar 2019 to mar 2020

Does opnsense not update its certificate, is this the cause of the problem and if so how do i update it?