certificate invalid error for device login

Hi Nihal

There are more possibilities, but it depends of your environment and conditions

- you can Import the FG ca cert to your local certificate store (trusted ca store)

- use Firefox and create an exeption

- you can create a csr and purchase and import a signed ssl certificate (IP or namebased)

https://docs.fortinet.com/d/fortigate-how-to-purchase-and-import-a-signed-ssl-certificate

- you can import (if you have) an exisiting wildcard certificate (needs a dns record for the FG)

Good luck

Markus