Mozilla Thunderbird/directory certificate not trusted

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If you get an error message while typing an email address that reads directory.education.ucsb.edu:636 uses an invalid security certificate and reports Error code: sec_error_expired_issuer_certificate, these instructions should help you fix it.

Trust the directory certificate

Open Thunderbird, then click Write to compose a message.

Thunderbird write.png


Type an email address. Enter your password if prompted. When the error message appears, STOP!

Click View Certificate.

Directory uses an invalid security certificate.png


Click the Details tab, then click the Export... button.

Thunderbird view certificate details.png


Save the file to your Desktop

Thunderbird save cert to desktop.png


Click Close. Click Cancel.

Now, click Thunderbird → Preferences...

Thunderbird preferences.png


Click Advanced → Certificates → View Certificates

Thunderbird view certificates.png


Click the Servers tab, then click Import...

Thunderbird import certificate manager servers tab.png


Find and open the file you saved. It's probably called directory.education.ucsb.edu.

Thunderbird open directory cert.png


Select the certificate and click Edit...

Thunderbird select cert and click edit.png


Check the Trust the authenticity of this certificate. box, and click OK.

Thunderbird trust the authenticity of this certificate.png


Click OK, then close the Preferences dialog.

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