I'm trying to visit my university research group's website at home. The website requires a username and password to view and probably has who knows what kind of security systems in place.

On Safari 10 and/or macOS 10.12, I could visit the website and enter my username and password; it wouldn't save the password despite repeated attempts on my part at making it do so, but at least I could visit the site.

On Safari 11 and macOS 10.13, however, I get the following message:

This connection is not private

This website may be impersonating [website] to steal your personal or financial information. You should go back to the previous page.

I have two options: "Show Details" and "Go Back". If I press "Show Details", I get the following message below the previous one:

Safari warns you when a website has a certificate that is not valid. This may happen if the website is misconfigured or an attacker has compromised your connection.

To learn more, you can view the certificate. If you understand the risks involved, you can visit this website.

If I click on "view the certificate", I can see the certificate details, where it explicitly says "This certificate is marked as trusted for [website]".

If I click on "visit this website", I am asked for my administrator password to change certificate trust settings. After entering my password, I am redirected to the original "This website may be impersonating [website]" message.

I don't have this problem with other browsers (e.g. FireFox) or other remote access clients (e.g. FileZilla), so it isn't a problem with the website, it is a problem with Safari.

I've tried deleting the certificate in Keychain Access and creating it again, and I have tried restarting my computer. I am the administrator (and sole user) of my computer. My internet connection is secure and doesn't have any firewalls (it's just a home wi-fi connection).

What can I do to regain access to my group's website and preferably force Safari to remember my login information?

  • I found about 6 different questions with various answers on this site. Have you done a search for similar questions and tried those answers? – fsb May 15 '18 at 15:29
  • I did an admittedly very quick search because I was pressed for time. On that very quick search I was unable to find exactly what I was looking for, but I’ll do a more thorough search tonight. – Rain May 15 '18 at 15:33
  • Thanks! There might be some answers there that can help you. To avoid duplicate answers, you can edit your question to reference the Q&A that you tried but didn't work. – fsb May 15 '18 at 16:20

After searching for hours and trying several different "fixes" which didn't work, Trevor Da Silva's solution here worked.

The fix essentially consists of deleting the problematic site's certificate, opening the site in a private Safari window, choosing to trust it and then retrying in a regular Safari window.

  • Welcome to Ask Different! While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – Tetsujin Jun 18 '18 at 6:47
  • Done. Don't think the lack of info was cause for a downvote, but there you go. – Rain Jun 18 '18 at 11:18

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