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Troubleshooting Incorrect Name Resolutions
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In some cases, client computers are able to complete the DNS name resolution process, but the DNS server supplies them with outdated or incorrect information. If the clients are attempting to resolve names for which the DNS server is the authoritative source, it is possible that the DNS server has bad information in its resource records. This could be attributable to any of the following causes:
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Incorrect resource records If your DNS servers rely on administrators to man ually create and modify resource records, the possibility of typographical errors always exists. If this is the case, the only solution is to manually check and correct the resource records on the server. Dynamic updates failed to occur If you have configured your DNS servers to use dynamic updates, and those updates have not occurred for any reason, the server s resource records could contain incorrect or outdated IP addresses. In this event, you can correct the resource records manually, or trigger a new dynamic update by trav eling to the computer whose resource record is wrong and typing ipconfig /regis terdns at a command prompt. This causes the DNS client on the computer to re-register its IP address with the DNS server. If dynamic updates still fail to occur, check to see whether the server supports them and is configured to accept them. Zone transfers failed to occur If the DNS server is incorrectly resolving names from a secondary zone, it is possible that a zone transfer has failed to occur, leav ing outdated information in the secondary zone database file. Try to manually trig ger a zone transfer. If the zone transfer still does not occur, the problem might be due to incompatible DNS server implementations, such as different compression formats or unsupported resource record types. If this is the case, you might have to update the secondary zone s resource records manually, until you can update one or both servers to compatible DNS software implementations.
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If the DNS server supplying incorrect information is not the authority for the names it is resolving, it is possible that the server s cache contains incorrect or outdated information. The best solution for this problem is to clear the cache, which you do in Windows Server 2003 by clicking the server s icon in the DNS console and, from the Action menu, selecting Clear Cache.
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DNS servers supplying incorrect information, whether from their own zones or from the cache, might be doing so because an unauthorized user has planted the incorrect information or polluted the cache. See Lesson 5 of this chapter for more information on DNSrelated security hazards, and techniques for protecting your servers from them.
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Troubleshooting Outside Name Resolution Failures
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In some cases, you might discover that a DNS server can successfully resolve names for which it is the authority, but fails to resolve names in other domains. This problem is typically due to a recursion failure, meaning that the server is not forwarding queries for other domains to the appropriate place, or is not forwarding queries at all. One possible cause of recursion failures is that the server is configured with incorrect root hints. The root hints are a DNS server s list of root name server addresses, which it uses to resolve names outside its domain. If the server cannot contact one of the root name servers, it cannot discover the IP addresses of the authoritative servers for the domain that contains the name it is trying to resolve. The DNS server in Windows Server 2003 comes preconfigured with root hints for the Internet root name servers, as shown in Figure 4-18.
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Figure 4-18 The Root Hints tab in a DNS server s Properties dialog box
The addresses of the Internet root name servers rarely change, and it is not likely that a Windows DNS server would be unable to contact even one of these servers, unless someone modifies the root hints. It is more common for a network connectivity problem to be affecting the server s communication with the root name servers.
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