Link formatting in a wiki page

Question

A developer is including some links in a wiki page for reference for our developers and our clients, and one of the links will not take on the link format (clickable, etc.). He's asking why and I don't find this in the docs. My guess is that it's one or more of these reasons? 
 
 The link requires VPN access 
 The link has .local in it (xxx.xxx.local/.../... 
 The link has a statement like this at the end: /define?grain=patient 
 
 If you can help me explain this to the user, thank you!

Ben Tiedt · Accepted Answer

URLs in content are subject to the URL validation rules defined in Administration > Moderation > Content Filtering > URL Validation as well as the Content Filtering configuration for the specific type of content (in Administration > Applications > Content > [Select content type] > Filtering > URL Validation). 
 By default, IP addresses, local hostnames, and hosts that resolve to internal IP addresses are not allowed.