How to import a root certificate on a Nokia 9300i

My ISP offers an SSL encrypted connection to it's SMTP server but the signing authority of the SSL certificate was not recogized by my Nokia 9300i and it was a bit of a hassle to import the root certificate manually on the device.

You'll need a DER format file, DER format files are generally offered with a .crt or .der extention. If you can only get a PEM file (.pem extention) this needs to be converted. On a Unix/Linux machine with OpenSSL installed this can be done with a command like: 

openssl x509 -outform der -in MYCERT.pem -out MYCERT.der
  1. Download the root certificate in DER (binary) format to your Nokia 9300i so that it's available as a file.
  2. Open the Control panel (in the Tools folder) on the 9300i.
  3. Select the Security category and then the Certificate manager sub-category.
  4. The Certificate manager has the following tabs: User, Other & Password. Select Other.
  5. Click on the button to the right of the text Add.
  6. Select the file mentioned at step 1 directly if it's available in the current folder or click on the button to the right of the text Browse and then make your way to the file.
  7. If you select the certificate file, you'll get to see the details of the certificate and you have the option to Add it or Cancel.
  8. Select the certificate in the list under the Other tab and press on the enter button or the button to the right of the View details text.
  9. Press the button to the right of the Trust settings text.
  10. You can configure the Trust settings for 4 options. The Secure networking option should be set to YES.
  11. Press the button to the right of the Done text and close the screens of the Control panel.