Cannot connect to certain websites

I can't browse certain websites - Apple Community

SOLVED: Internet Explorer cannot display the webpage Reset Internet Explorer. This will reset all settings and custom options set in Internet Explorer. Your … Can't access certain websites through wifi on any devices Feb 25, 2016

PR_END_OF_FILE_ERROR, cannot connect to certain websites

Websites Not Opening in VPN [Fix] 1. Correct your network adapter MTU [works 80% of time] MTU is the packet size that helps making a connection between your Computer and the server. If it is not properly determined, you will face issues. To correct MTU size, follow steps: Open Comment prompt (cmd) with administrator privileges.

Windows: Cannot Connect to Certain Web Sites - Technipages

Starting this weekend, I have been unable to connect to certain websites. The one that consistenly is a problem (completly unable to connect to) is stackoverflow.com.