NetTools is a free AD troubleshooting tool, which provides the ability to troubleshoot, query, report and update Active Directory and other LDAP based directories. It includes over 80 different features to help with AD troubleshooting, including a powerful and feature rich LDAP client with over 280 predefined LDAP queries.
Some of the features in NetTools
AD Replication
Capability to test and view AD Replication, Replication Queues, Replication Cursors, Meta Data, and DirSync
Authentication
View Kerberos tickets, test SPN registrations, Identify token bloat issues, SID History management, Sessions, User Rights and more
Groups
Group management, view server's local group membership, check for infinite loops, group compare
Group Policies
GPO Explorer allows you to view policies, settings, WMI filters, and policy allocations in the domain
LDAP
A feature rich and powerful LDAP Client, LDAP Browser, and compare LDAP Objects, over 280 predefined LDAP Queries
Schema
The ability to browser the AD Schema and structure, view schema update history, and AD & Exchange schema versions
Name Resolution
A number of options to test name resolution, include DcGetDCName, and test common AD ports are open or blocked
Network
A number of options to display HTTP headers, Geo IP, Trace Route, Ping, WhoIs, URL and UNC Checkers
Users
User search, troubleshooting for locked accounts, Org structure, and the history of groups changes for a user
Miscellaneous
A number of additional features, Windows error codes, ASN.1 Viewer, Base64 and time converters, SID Name resolver and AdminSDProp reporter.