We upgraded our DEV environment to 4.1.1,pam client works fine. But when we launch another client for connecting to PROD environment which runs on previous version 4.0, it is not launching. So in short we are not able to launch client parallelly for two version.
Release : 4.1
Every pam client version must be the same as PAM appliance
So if pam client is running with 4.1.1 appliance and you try to log in a pam 4.0 it will re-install pam client to 4.0
So in short, you will not be able to login to 2 different appliances from different versions without changing pam client executables.
In this case it can be a permissions problem as is reported that PAM Client is not able to do anyting.
Be sure you the user has full access permisions over the pam client folder.