Password Policy is not working

Hi,

we are trying to implement Pasword Policy on our clients.

it is windows 2008 active directory environment.

we changed Password policy settings on Default domain policy.

we disabled complexity setting and all the others.

we checked client with RSOP and confirmed that setting is updated on client.

but still when we try to change password on client, it warns as

The password does not meet the password policy requirements. Check the minimum password legth, password complexity and password history requirements."

Any idea.