vb.net 2d barcode free The Process of Troubleshooting Network Problems in Visual C#.NET

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The Process of Troubleshooting Network Problems
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CHapTER 31
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C:\>tracert www.contoso.com Tracing route to www.contoso.com [10.73.186.238] over a maximum of 30 hops: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 d820.hsd1.nh.contoso.com. [192.168.1.196] 192.168.1.1 c-3-0-ubr01.winchendon.ma.boston.contoso.com [10.165.8.1] ge-3-37-ur01.winchendon.ma.boston.contoso.com [10.87.148.129] ge-1-1-ur01.gardner.ma.boston.contoso.com [10.87.144.225] 10g-9-1-ur01.sterling.ma.boston.contoso.com [10.87.144.217] te-9-2-ur01.marlboro.ma.boston.contoso.com [10.87.144.77] 10g-8-1-ur01.natick.ma.boston.contoso.com [10.87.144.197] 10g-9-1-ur01.sterling.ma.boston.contoso.com [10.87.144.217] te-9-2-ur01.marlboro.ma.boston.contoso.com [10.87.144.77] 10g-8-1-ur01.natick.ma.boston.contoso.com [10.87.144.197] 10g-9-1-ur01.sterling.ma.boston.contoso.com [10.87.144.217] te-9-2-ur01.marlboro.ma.boston.contoso.com [10.87.144.77] 10g-8-1-ur01.natick.ma.boston.contoso.com [10.87.144.197]
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If any routers on line 2 or above respond (it doesn t matter if the final host responds), the client computer and the default gateway are configured correctly . The problem exists with the network infrastructure, or your Internet connection may have failed . Follow the troubleshooting steps described in the next section, How to Troubleshoot Application Connectivity Problems, or contact network support to troubleshoot the problem .
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To double-check your results, repeat these steps from another client computer on the same network . If the second client computer exhibits the same symptoms, you can be confident that part of the network infrastructure has failed . If the second client can successfully communicate on the network, compare the IPConfig /all output from the two computers . If the Default Gateway or DNS Server addresses differ, try configuring the problematic computer with the other computer s settings . If this does not resolve the problem, the problem is unique to the problematic computer and may indicate a hardware or driver problem (see 30) .
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How to Troubleshoot application Connectivity problems
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Sometimes, you might be able to access the network with some applications but not others . For example, you might be able to download your e-mail but not access Web servers . Or, you might be able to view pages on a remote Web server but not connect to the computer with Remote Desktop . Several issues might cause these symptoms (in rough order of likelihood):
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The remote service is not running . For example, Remote Desktop might not be enabled on the remote computer .
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CHapTER 31 Troubleshooting Network Issues
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The remote server has a firewall configured that is blocking that application s communications from your client computer . A firewall between the client and server computer is blocking that application s communications . Windows Firewall on the local computer might be configured to block the application s traffic . The remote service has been configured to use a non-default port number . For example, Web servers typically use TCP port 80, but some administrators might configure TCP port 81 or a different port .
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To troubleshoot an application connectivity problem, follow these steps:
Before you begin troubleshooting application connectivity, first verify that you do not have a name resolution problem . To do this, open a command prompt and run the command Nslookup servername . If Nslookup does not display an answer similar to the following example, you have a name resolution problem . See the section titled How to Troubleshoot Name Resolution Problems later in this chapter .
C:\>nslookup contoso.com Non-authoritative answer: Name: contoso.com 10.46.232.182, 10.46.130.117 Addresses:
Identify the port number used by the application . Table 31-2 lists port numbers for common applications . If you are not sure which port numbers your application uses, consult the application s manual or contact the technical support team . Alternatively, you can use a protocol analyzer, such as Network Monitor, to examine network traffic to determine the port numbers used .
TABlE 31-2 Default Port Assignments for Common Services and Tasks
SERVICE NAME OR TASK
Web servers, HTTP, and Internet Information Services (IIS) HTTP- Secure Sockets Layer (SSL) DNS client-to-server lookup (varies) DHCP client File and printer sharing FTP-control FTP-data Internet Relay Chat (IRC) 137 53
80 443 53 67 139, 445 21 20 6667
The Process of Troubleshooting Network Problems
CHapTER 31
SERVICE NAME OR TASK
Microsoft Office Outlook (see POP3, IMAP, and SMTP for ports) Internet Mail Access Protocol (IMAP) IMAP (SSL) LDAP LDAP (SSL) Message Transfer Agent (MTA) X .400 over TCP/IP POP3 POP3 (SSL) RPC endpoint mapper SMTP Network News Transfer Protocol (NNTP) NNTP (SSL) POP3 POP3 (SSL) SNMP SNMP Trap SQL Server Telnet Terminal Server and Remote Desktop Point-to-Point Tunneling Protocol (PPTP) (See 27 for more information .) Joining an AD DS domain (See the section titled How to Troubleshoot Joining or Logging on to a Domain later in this chapter for more information .) After identifying the port number, the first step in troubleshooting the application connectivity problem is to determine whether communications are successful using that port . If it is a TCP port, you can use PortQry, Test TCP, or Telnet . Of those three tools, Telnet is the least flexible, but it is the only tool included with Windows (but note that it is not installed by default) . For more information about Telnet, including how to install it, see the section titled Telnet Client earlier in this chapter . 161 162 1433 23 3389 1723 143 993 389 636 102 110 995 135 25 119 563 110 995
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