Have you ever come across this error message?

403.6
Forbidden IP address of the client has been rejected

If you are using Small Business Server you might come into this quite fast as by default it will lock down IIS to keep machines who are not on the same subnet from accessing the web server.

This means if you VPN in you can’t browse the intranet site.  Oops, that’s not good.

To fix this problem, you need to edit the website and iis application properties in IIS.  On the Directory Security tab edi the IP address and domain name restrictions.  Change the settings on there from “Deny” to “Grant” and you will be all set.