advanced button does noet work in Your connection is not secure
I get a warning Your connection is not secure on accessing the morningstar.nl website. The buttons are not displayed but that can be solved by zooming. Then two buttons are visible, Return and Advanced. But the Advanced button does not work: Ino error code information is displayed and I cannot proceed further. I am using Firefox 53.0.3 and Linux Mint 17.3 Rosa. The problem occurred after the last Firefox update on Friday May 26. Before, I got the same message, but could nevertheless proceed further to this website. Is it a Firefox or Linux related problem?
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There has been a small Mint update, and I mailed the problem to morningstar benelux. Which one helped, I don't know; but there were no problems today in accessing the site. Problem solved for the time being, I should say.
This looks like a website that you access via an open HTTP connection. Firefox 51+ will mark HTTP connections with a padlock with a strike through and shows "Connection is Not Secure" if you click the Control Center 'i' button at the left end of the location/address bar.
Note that this message is meant as a warning that you could be vulnerable and that it shouldn't prevent (block) you from accessing the website. You can press the ESC key to close a doorhanger with a warning message in the name and password field.
You can always first try these steps in case of issues with web pages:
You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
- hold down the Shift key and left-click the Reload button
- press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
- press "Command + Shift + R" (Mac)
Clear the cache and remove the cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).
"Clear the cache":
- Preferences -> Advanced -> Network -> Cached Web Content: "Clear Now"
"Remove the cookies" from websites that cause problems.
- Preferences -> Privacy -> "Use custom settings for history" -> Cookies: "Show Cookies"
Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.
- switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
- do NOT click the "Refresh Firefox" button on the Safe Mode start window
Thank you for the many tips to tackle this problem if it occurs again. The blocking pop-up disappeared yesterday as suddenly as it appeared at the end of last week. I can only tell you what did not work: no reaction on ESC; closing Firefox removes cookies, but the problem remained when restarting Firefox and going from the starting page (wikipedia) immediately to the website. The problem had disappeared before I read your elaborate answer, so I did not try clearing the cache or restarting in safe mode. I suspect that the website owner has changed something, but it is still http:. Firefox gives a warning, but it no longer blocks access to the site.