Script Download: NAV3tierTroubleshooting.zip
http://gallery.technet.microsoft.com/scriptcenter/Script-for-NAV-3-tier-fab4aa81 

This PowerShell script is designed to help troubleshooting Dynamics NAV 3-tier installations by extracting the information that is typically used, rather than looking around in Active Directory to find it manually.

Installing NAV in a 3-tier configuration requires updates to Active Directory. If client connections fail, then often the cause is some missing or wrong Active Directory settings. This script is designed to extract the most likely areas where the problem is.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery