Why the HTTP 403 error appears?

Log In

The website may want the user to log in before accessing the site. If the user did not log in and tried to access the site, the website will display the HTTP 403 error. See Things to know about “HTTP 403 Forbidden”.

Proxy Blocking

The address could be blocked if your computer is running through a proxy. Employers typically set up proxies for their computer networks, which block certain websites from being accessed by employees.

Server Side

The server administrator could be responsible, if she needed the website to be blocked during maintenance or for other reasons.

Disabled by Host

The website hosting service may decide to forbid access to the website. This is typically due to a violation of the terms of service by the other party.

 Might you like to seeHow to Fix HTTP Forbidden Error 403 in Internet Explorer.

Via Ehow