A number of AnswerHub and Forum posts link to pages at udn.unrealengine.com. I also have a documentation from an Unreal plugin vendor that references posts on udn.unrealengine.com.
To access AnswerHub, Forums and Wiki, you use your Unreal email/password credentials. However, udn.unrealengine.com requires a user name (not email) and password. There appears to be no way to create an account on the site. I’m guessing this site predates Unreal being available for free.
Is it possible to access these pages? If so, how?