Welcome to the Centrify Express community.
Some notes:
- You don't need Centrify OpenSSH (unless you have specific use cases), you can use Stock SSH.
- Remember that we implement the latest security measures like refusing keys smaller than 1024 bits. More info here:
http://community.centrify.com/t5/TechBlog/How-to-avoid-authentication-issues-using-Centrify-OpenSSH-built/ba-p/25393
Use the su command to verify that the issue is strictly related to OpenSSH. (e.g. su - i87000 and type the AD password), you'll note that you can switch succesfully and confirm that the issue is with OpenSSH. You an debug OpenSSH to pinpoint the issue (See below) or simply uninstall Centrify-enhanced OpenSSH in favor of stock SSH. - Centrify Express for UNIX works in workstation mode and uses auto-private group (user's UID as the primary group) therefore if you use getent you won't see it.
This post has tips on troubleshooting OpenSSH: http://community.centrify.com/t5/Centrify-Express/Network-error-Connection-refused/td-p/22199
R.P