This issue occurs when a web browser is accessing a website that has a security certificate installed (for SSL/TLS data encryption) which cannot be verified or installed by the web browser.
To solve this issue, we recommend you to temporarily turn off the Scan SSL feature in Bitdefender as follows:
1. Bring up the main Bitdefender interface.
2. Click on the Protection icon in the left security panel.
3. Click on the Settings button in the ONLINE THREAT PREVENTION module.
4. In the Web Protection panel, use the switch to temporarily turn off Encrypted Web Scan feature.
Now close the Bitdefender window and try to access the webpage again.