1. If this happens when trying to access any specific website, add the website to trusted zone.
· Go the Website you want to add to a zone.
· Press ALT+D to select the Web address, and press CTRL+C to copy it to the Windows Clipboard.
· This saves you from having to type it later.
· On the Internet Explorer Tools menu, click Internet Options.
· Click the Security tab, and then click the Trusted sites.
· In the Add this Web site to the zone box, press CTRL+V to paste in the Web address.
· If you want to add an unsecured Web site (for example, a site that does not have https:// in the Web address), click to remove the check in the Require server verification box
· Click the Add button.
2. If the problem is caused by damaged or incompatible Internet Explorer settings or add-ons, you can usually resolve the problem by resetting Internet Explorer settings.
· Exit all programs, including Internet Explorer (if it is running).
· If you use Windows XP, click Start, and then click Run. Type the following command in the Open box, and then press ENTER:
· If you use Windows Vista, click Start. Type the following command in the Start Search box, and then press ENTER:
· The Internet Options dialog box appears.
· Click the Advanced tab.
· Under Reset Internet Explorer settings, click Reset. Then click Reset again.
· When Internet Explorer finishes resetting the settings, click Close in the Reset Internet Explorer Settings dialog box.
· Start Internet Explorer again.
3. If you receive the same error message on other web browsers too, the issue may be related to a corrupt Domain Name System (DNS). Follow the steps listed below:
· Click Start and select Run .
· Type cmd and hit ENTER.
· Type ipconfig /flushdns and hit Enter.
· You should get a message that says: Successfully flushed the DNS Resolver Cache
4. If it still doesn't work, verify your adjustments are still in place after a restart and then release and renew the IP configuration settings from your network device.
· Click Start, Run and in the box type “cmd” and press Enter.
· Click OK to open a command prompt window and then type in the following commands:
· Restart your computer and test your connectivity.
5. Try running Windows Update and install the latest "Roots Certificate Update". It's not designated by Microsoft as a critical update so you have to select "custom" instead of "express" updates, then select software optional updates.