Patterns and Practices: WCF Security Guidance available online

The Microsoft Patterns and Practices team has created a guide for WCF security.

https://blogs.msdn.com/jmeier/archive/2008/03/27/patterns-and-practices-wcf-security-guidance-now-available.aspx

You can find more information at the root site

https://www.codeplex.com/WCFSecurity/