Ad blockers and privacy extensions are the most common inadvertent blockers. They often use lists that mistakenly flag a legitimate site as a malware distributor.
Click the located to the left of the address bar. Toggle the Enhanced Tracking Protection switch to OFF .
Occasionally, a browser extension or "add-on" may inadvertently or maliciously block certain websites. Open the Menu and select Add-ons and themes. Toggle off all extensions. Refresh the blocked site. If it works, re-enable them one by one to find the culprit. Troubleshooting SSL and Connection Errors