CA issued SSL certificates have a maximum validity of 13 months. When (or preferably before) the certificate expires, it needs to be replaced. That is done by overwriting the current .crt and .key files with the new ones and then restarting Saga. This documentation describes how to do that.
Get the Correct Certificate Files
As explained in Saga SSL Certificate Management, there are binary and textual certificate file formats and within those formats, there are variations. Saga requires the two-file, PEM formatted, variant of the SSL certificate. The files of that format have a .key and a .crt file extension.
If the new certificate is provided in any other format than the two-file PEM format, then it must be converted to that format. If the certificate is a .pfx file, then Saga SSL Certificate Management has instructions on how to convert it to .key and .crt. For other format, contact the certificate provider to obtain the right formatted fies.
Place the Two Certificate Files into the Correct Location
The .key and the .crt files are to be placed into directory D:\Program Files\ayfie\saga\volumes\Traefik\certs (the path assumes the recommended install directory D:\Program Files\ayfie\saga) and given the same names as the two files that are replaced.
Restart Saga
.For the updated certificate to take effect, Saga must be restarted by running these commands (in line 1, the recommended install path is assumed):
cd "D:\Program Files\ayfie\saga" .\stop-saga.ps1 .\saga.ps1