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The next thing to try is to verify that you are sending data to the correct port For example, your web browser automatically tries to connect to port 80 on a server; if the administrator of that server changes the port value, you will need to specify the port when you make the connection Table 6-11 lists the standard port settings for commonly used protocols You can use the telnet tool to verify that the other computer is con gured to permit connections on the same port you are using If you do not receive an error
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message, the other computer is con gured to enable connections If you do receive an error, try looking at the settings on the remote computer to verify that they are set up properly
Name Resolution Problems
Suppose you are able to connect to a remote host by IP address but are unable to connect via its hostname This indicates a name-resolution problem In the Microsoft world, there are two types of computer names: fully quali ed domain names (FQDN) used by socket-based applications and NetBIOS names (computer names) used by NetBIOS applications These names can be resolved in several ways, including using the Domain Name System (DNS), Windows Internet Naming Service (WINS), a hosts le, or an lmhosts le Each method has its advantages and disadvantages
Although there are many techniques used to resolve the two different style names, for the exam, have it clear
that DNS resolves FQDNs to IP addresses whereas WINS resolves NetBIOS names to IP addresses
Troubleshooting with TCP/IP Utilities
Name-Resolution Order
The two types of Microsoft computer names each work a little differently They can use the other s services; however, they use their own resolution methods rst When communicating with a FQDN, the name is resolved by the following resolution methods (in order): 1 Checking local name 2 Checking local HOSTS le 3 Checking DNS servers 4 Checking local NetBIOS cache 5 Checking WINS servers 6 Broadcasts NetBIOS name resolution works in a very similar way The NetBIOS name is resolved by using the following method: 1 Checking its local NetBIOS cache 2 Checking the WINS server 3 Broadcasting for computer 4 Checking LMHOSTS le 5 Checking local hostname (if Enable DNS for Windows Resolution is checked in TCP/IP properties) 6 Checking TCP/IP HOSTS le 7 Checking DNS servers By knowing the order of name resolution, you can better understand how these services work and effectively troubleshoot them
Check the Hosts File
You can start by checking the hosts le A hosts le is a text le that can be con gured with any standard text editor It contains static mappings for remote TCP/IP hosts by using an IP address column and a hostname column Each computer has its own host le, HOSTS, located in %windir% for Windows 95\98, and HOSTS located in %SystemRoot%\System32\Drivers\Etc for Windows NT/2000/ XP/2003
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TCP/IP Utilities
Because every machine maintains its own HOSTS le, they are not generally used in medium or large environments If a modi cation or addition has to be made, each machine needs to receive this update by receiving a new version of the hosts le When you are talking about four or ve machines, it s not that bad When you have to keep 150 machines up to date, it can become very dif cult Figure 6-19 shows an example of a hosts le To check your HOSTS le, open it and scan for the entry of the remote host If use of this le is the method by which your computer is resolving addresses, verify that the entry exists and that it contains the correct information If this is not the resolution method you are using, trying checking your DNS con guration
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