Nslookup

Nslookup.exe is a command-line tool that you can use to test and troubleshoot DNS issues. You can use Nslookup to perform DNS queries and to examine the contents of zone files on local and remote servers. Nslookup is available only if the TCP/IP protocol is installed on the computer.

For more information, visit the following Microsoft website:

• http://technet.microsoft.com/en-us/library/cc725991(WS.10).aspx

Articles and Videos

The following articles and videos demonstrate how to troubleshoot and diagnose issues using the Nslookup tool:

	Single sign-on authentication to Office 365 doesn't work from a specific device, but works from other devices This article shows you how to troubleshoot several of the error messages that may occur when you try to access Office 365 resources through a web-based client or a rich client application by using federated user credentials, or when you use a web browser to access the Office 365 portal from the same computer by using federated credentials.
	How to troubleshoot Windows Azure Active Directory Sync tool installation and Configuration Wizard error messages This article discusses general troubleshooting procedures, lists error messages that may occur when you install or configure the Directory Synchronization tool, and contains information about how to resolve the issue.
	Troubleshoot domain verification issues in Office 365 This article shows you how to troubleshoot issues that may occur when you try to verify a domain in Office 365.