Password history setting is greyed out

[JonathanMortimer]

Hi,

For some reason one of the PCs here has a password history of 24, but it should be 0. I cannot change it even if I log in as Administrator. It is on a domain. How can I change this to 0?

Thanks!

 

[linney]

Are there any clues in this article?

Enforcing Strong Password Usage Throughout Your Organization

http://technet.microsoft.com/en-us/library/cc875814.aspx

 

[JonathanMortimer]

Yes, thank you, although the explanation tab introduced with SP3 or some other Windows update explains it in simpler terms (the original machine in question was SP2).

As I suspected, it's following the domain controller security settings.