Self-Signed Certificate in Certificate Chain

Situation

A firewall returns the following error for an executed backup plan: SSL certificate problem: self-signed certificate in certificate chain.

Cause

The certificate is self-signed, so it is not trusted by default.

Solution

Add Certificate Contents to .cacerts.pem File Manually

To add the contents of the certificate that produced this error, proceed as follows:

1. Convert your .cer certificate file to a .pem certificate. To do this, use the following command in a terminal emulator: openssl x509 -in certname.cer -inform DER -out certname.pem -outform PEM
2. Open the new file (certname.pem) in any text editor.
3. Copy the contents of the file.
4. Navigate to /Applications/backupname.app/Contents/Resources/share.
5. Find the .cacerts.pem file and open it in a text editor.
6. Scroll to the end of the .cacerts.pem file, and paste the certificate contents of the certname.pem file.
7. Save the .cacerts.pem file.