How do you get rid of the pop-up stating a certificate expired?

Hi J9mcneely,

Thank you for participating in the Apple Support Communities. Do you see this pop-up when visiting specific websites using Safari? If so, this article provides some information about this: If you see a 'Not Secure'' warning while browsing with Safari.

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Safari warns you when a website that you're visiting isn't secure. 

In any of these cases, you may see a “Not Secure” or “Website Not Secure” message in Safari:

• The website is encrypted, but its certificate is expired or illegitimate.
• The website's certificate is valid but the version of TLS is not secure (TLS version 1.1 or earlier). 
• The website is unencrypted and asking you to enter password or credit card information.

Never enter your password or credit card number on sites with this warning. If you need to use the site, contact its owner or administrator and let them know that their site isn't secure.

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Take care.

Hi J9mcneely,

That could be related. You'll also want to make sure that you're running the latest iOS available for your iPhone as this may help with resolving the issue you're facing. You can verify this in Settings > General > Software Update.

You can also try clearing your browser history and cache. Check this out: Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch

Kind regards.