Problems accessing sharepoint server on the server (when using with hostheader)

This problem can be solved by adding the hostname to a registry value, all the needed information, you will find in the links below
Links:

• http://blogs.bluethreadinc.com/thellebuyck/archive/2008/10/30/401.1-error-when-accessing-sharepoint-from-server.aspx
• http://support.microsoft.com/kb/926642 & http://support.microsoft.com/kb/896861
• Diagnose IIS Errors: http://blogs.msdn.com/david.wang/archive/2005/07/14/HOWTO_Diagnose_IIS_401_Access_Denied.aspx
• Problems crawling (access denied) this hostname: DisableLoopback, more info @ http://dotnet.org.za/zlatan/archive/2008/11/19/access-is-denied-check-that-the-default-content-access-account-has-access-to-this-content-or-add-a-crawl-rule-to-crawl-this-content.aspx