Although it is not primarily a troubleshooting tool, Telnet Client is extremely useful for determining whether TCP-based network services are reachable from a client. Most commonly used network services are TCP based, including Web services, mail services, and file transfer services. Telnet Client is not useful for troubleshooting UDP-based network services such as DNS and many streaming media communications.
Telnet Client is not installed by default in Windows 7. To install it, run the following command from a command prompt with administrative privileges.
start /w pkgmgr /iu:"TelnetClient"
Alternatively, you can install it by following these steps:
- Click Start and then click Control Panel.
- Click Programs.
- Click Turn Windows Features On Or Off.
- In the Windows Features dialog box, select the Telnet Client check box. Click OK.
Telnet Client is useful only for determining whether a service is reachable, and it will not provide information that you can use for troubleshooting name resolution, network performance, or network connectivity problems. Use Telnet Client only after you have used Ping to eliminate the possibility of name resolution problems. For more information about Ping, see the section titled "Ping" earlier in this tutorial.
In this tutorial:
- Troubleshooting Network Issues
- Tools for Troubleshooting
- Table-1 Network Troubleshooting Tools
- How to Identify a Problem with the ARP Cacher
- How to Clear the ARP Cache
- Event Viewer
- How to View Shared Folders on the Local Computer
- How to View Shared Folders on Another Computer
- Network Monitor
- Verifying that the Default DNS Server Resolves Correctly
- Verifying that a Specific DNS Server Resolves Correctly
- Verifying Specific Types of Addresses
- Using TCP for DNS Lookups
- PathPing Output
- Routing Loops
- Performance Problems
- Possible Connectivity Issues
- No Connectivity Issues
- Performance Monitor
- Data Collector Sets
- Windows Resource Monitor
- Identifying the TCP Port for a Service
- Windows 7 Testing Service Connectivity
- Determining Available Remote Management Protocols
- Why PortQry Is Great
- Task Manager
- Telnet Client
- Testing Service Connectivity
- Test TCP
- Windows Network Diagnostics
- The Process of Troubleshooting Network Problems
- How to Troubleshoot Network Connectivity Problems
- How to Troubleshoot Application Connectivity Problems
- Default Port Assignments for Common Services and Tasks
- How to Troubleshoot Name Resolution Problems
- How to Verify Connectivity to a DNS Server
- How to Use the Hosts File
- How to Troubleshoot Performance Problems and Intermittent Connectivity Issues
- How to Troubleshoot Joining or Logging on to a Domain
- How to Verify Requirements for Joining a Domain
- How to Troubleshoot Network Discovery
- How to Troubleshoot File and Printer Sharing
- How to Troubleshoot File and Printer Sharing from the Client
- How to Troubleshoot File and Printer Sharing from the Server
- How to Troubleshoot Wireless Networks
- Network Diagnostics
- How to Troubleshoot Firewall Problems