Cannot Connect to Backblaze due to Security Certificate - Mac

Due to a widely used internet certificate expiring on September 30th, users running older versions of their operating systems will need to update their certificate manually in order to access our website along with other websites, as well as to continue backing up.


Mac users on operating systems 10.9. 10.10, or 10.11 would be unable to access our site and continue backing up due to this issue. This issue can present as an Insecure Connection error when trying to access or as the software itself reporting that the last backup was completed on September 29th, and that it has not been able to backup since then.


The first way to resolve this is to update your operating system to Mac OS 10.12 or later. If you are unable to update your operating system, please do the following procedure to manually update the certificate:


1. Visit to download the certificate, and save it in the Documents folder.

2. Open Terminal, paste this command, and press enter:

sudo security -v add-trusted-cert -d -r trustRoot -k "/Library/Keychains/System.keychain" ~/Documents/isrgrootx1.pem

3. You will be prompted to enter your Mac admin password, but won’t show input in the Terminal window as you type. You just need to type it in and hit enter.


4. After doing the above, navigate to and run our latest installer to ensure this change is implemented in our client.


5. Allow Backblaze to run for a few hours and then check back for progress.




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