In the Security Alert dialog box, click View Certificate.
"Certificate issuer untrusted or unknown" security alert
When signing in to an Adobe application, you receive the following alert:
This page requires a secure connection which includes server authentication. The certificate issuer for this site is untrusted or unknown...
Solution: Install the GlobalSign Root CA certificate
Adobe sign-in and activation processes require the GlobalSign Root CA certificate. Here's how to install it.
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Click the Certification Path tab, and select GlobalSign Root CA.
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Click View Certificate.
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Click Install Certificate.
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When you are prompted for an installation location, select Trusted Root Certification Authorities. Continue with the wizard, and then click Finish.
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Close the security alert and click Retry.