Problem visiting a website

[hakiza]

I get this message when visiting one website:
403 Forbidden
You don't have permission to access / on this server.

On another website, I get this:
Server not found
Firefox can't find the server at ... (... = website adress)

or (when using Konqueror)

The requested operation could not be completed
Unknown Host

I use Kubuntu 10.04 and I can visit other websites, except these two. I don't know if it is a matter of OS or something else.

Thanks.

[Snowhog]

Re: Problem visiting a website

403 Forbiden See HTTP Error 403 Forbidden
Server not found "server not found" or similar errors...a connection to the destination server could not be made. This can be the result of the DNS (Domain Name Server) you are using can't resolve the URL. Trying a different DNS may resolve the problem. See Solving Server not Found and DNS errors : 5 Free Fast DNS Servers

[hakiza]

Re: Problem visiting a website

@Snowhog: Thanks a lot for the info. "Server not found" error is now solved. The 403 Forbidden shall be solved by the owner of the web site and his/her ISP.