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f you need to frequently check whether numerous DNS records correctly resolve on numerous DNS servers, consider using DNSLint with the ql parameter instead

of Nslookup. This command can test name resolution for specific DNS records across many DNS servers very quickly. DNSLint can also help troubleshoot some DNS issues related to aD DS. DNSLint is a free download available from http://support.microsoft.com/kb/321045/.

You can also use Nslookup to verify specific types of addresses, including Mail eXchange (MX) addresses used to identify the mail servers for a domain . To identify the mail server for a domain, open a command prompt and run the following command .

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The server farm s automated analysis uses the same analysis engine that the Microsoft kernel debuggers use when you load a crash dump file into them (described shortly). The analysis generates a bucket ID, which is a signature that identifies a particular crash type. The server farm queries a database using the bucket ID to see whether a resolution has been found for the crash, and it sends a URL back to WerFault that refers it to the OCA Web site (http://oca.microsoft.com). If configured to do so, WerFault launches the Windows Error Reporting Console, or WerCon (%SystemRoot%\System32\Wercon.exe), which is a program that allows users to interface with WER for receiving problem resolution and tracking information as well as for configuring WER behavior. When browsing for solutions, WerCon contains an Internet browser frame to open the page on the WER Web site that reports the preliminary crash analysis. If a resolution is available, the page instructs the user where to obtain a hotfix, service pack, or third-party driver update.

For example, to use Nslookup to view all MX servers listed for the domain microsoft .com using the client s default DNS servers, type the following command .

Additionally, you can query a specific DNS server by listing the server name or IP address after the domain name in the following form .

hen a DNS server returns a response to a DNS query but the response contains more DNS records than can fit into a single UDp packet, the

client may decide to send the query again, this time using TCp instead of UDp. With TCp, multiple packets can deliver all the DNS records in the response. You can use Nslookup to test whether a DNS server can respond using either UDp or TCp. Use the following command to submit a UDp query to the DNS server.

The set vc parameter configures Nslookup to use a virtual circuit. This test can be especially useful when you are expecting a large number of DNS records in response to a query.

Perhaps the most useful tool for isolating connectivity problems from the client, PathPing (PathPing .exe) can help diagnose problems with name resolution, network connectivity, routing, and network performance . For this reason, PathPing should be one of the first tools you use to troubleshoot network problems . PathPing is a command-line tool whose syntax is similar to that of the Tracert and Ping tools .

effective tool for determining the state of network services. ping often reports that it cannot reach an available server because a firewall, such as Windows Firewall, is configured to drop Internet Control Message protocol (ICMp) requests. If a host is still capable of responding to ICMp requests, ping might report that the remote host is available even if critical services on the remote host have failed. To determine whether a remote host is responding, use the portQry support tool instead of ping.

PathPing displays its output in two sections . The first section is immediately displayed and shows a numbered list of all devices that responded between the source and the destination . The first device, numbered 0, is the host on which PathPing is running . PathPing will attempt to look up the name of each device, as shown here .

Tracing route to support.go.microsoft.contoso.com [10.46.196.103]over a maximum of 30 hops: 3 6 7 8 9 10 13 0 contoso-test [192.168.1.207] 4 10.125.39.213 5 1 10.211.240.1 2 10.128.191.245 10.128.191.73 gbr1-p70.cb1ma.ip.contoso.com [10.123.40.98]

tbr2-p013501.cb1ma.ip.contoso.com [10.122.11.201] tbr2-p012101.cgcil.ip.contoso.com [10.122.10.106] gbr4-p50.st6wa.ip.contoso.com [10.122.2.54] gar1-p370.stwwa.ip.contoso.com [10.123.203.177] 10.127.70.6 10.46.155.17 11 14 10.46.33.225 10.46.129.51 12 15 10.46.36.210 10.46.196.103

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