login issue

Hello, I'm having trouble logging into some of my servers. I can log into all my servers if I'm using my ssh agent, but if I use my password, the login fails on some servers. If I become root and then become anther user and then try to su - to anther user using a password it fails.

When something breaks the 1st thing you check is the last change. The last change was this. I moved all the servers from using md5 hashes for shoring our passwords to sha512. I looked in /etc/security/crypt.conf and /etc/security/policy.conf which are the files that where changed. They are the same when compared to each other. So I don't know why some servers are work and others are not.