Server Message Block (SMB) Message Signing...
...or how to shoot yourself in the foot with security. ;-)
Great article from Jesper M. Johansson (Enterprise Security Architect from Microsoft).
SMB Message Signing is one of Microsoft's top support call generators, and for good reason. It mitigates valid security threats, but is very complicated to use and can have far-reaching implications on the stability and functionality of your network.
Read the article in September Security Management column.