I am getting this message on a couple of sites I have used regularly. Any ideas? Thanks

The 403 Forbidden error displays inside the Internet browser window, just as web pages do.
Cause
The 403 Forbidden errors is an HTTP status code that means that accessing the page or resource you were trying to reach is absolutely forbidden for some reason.
Resolution
Check for URL errors and make sure the actual web page is specified. The most common reason for a web site to return the 403 Forbidden errors is if the URL is pointing to a directory instead of a web page.
If you're sure the page you're trying to reach is correct, the 403 Forbidden error message may be a mistake. At this point it's probably in your best
If some companies don’t allow access certain pages on the web if you are trying to access from home and you get the 403 forbidden then contact the webmaster on the page. Then if its from work and you cannot access or your colleague then contact the IT system administrator