How to determine and to recover from Winsock2 corruption in Windows Server 2003, in Windows XP, and in Windows Vista

Method 1: Use the Netdiag tool

To use the Netdiag tool, you must install the Microsoft Windows XP Support Tools. To do so, follow these steps.

Notes

• If you already have Support Tools installed, go to the second procedure in this section.

• If you do not have Support Tools installed and you do not have the Windows XP Setup CD, go to Method 2.

1. Insert your Windows XP Setup CD, and then locate the Support\Tools folder.

2. Double-click the Setup.exe file.

3. Follow the steps on the screen until you reach the Select An Installation Type screen.

4. On the Select An Installation Type screen, click Complete, and then click Next.

When the installation is complete, follow these steps:

1. Click Start, click Run, type Command, and then click OK.

2. Type netdiag /test:winsock, and then press ENTER.

The Netdiag tool will return the test results for several network components, including the Winsock. For more details about the test, use /v at the end of the netdiag command:
netdiag /test:winsock /v

Method 2: Use the Msinfo32 program

Note Use this method only if you do not have a Windows XP Setup CD and you do not have Support Tools installed.

1. Click Start, click Run, type Msinfo32, and then click OK.

2. Expand Components, expand Network, and then click Protocol.

3. You will have ten sections under Protocol. The section headings will include the following names if the Winsock2 key is undamaged:
   
   

   • MSAFD Tcpip [TCP/IP]
     

   • MSAFD Tcpip [UDP/IP]
     

   • RSVP UDP Service Provider
     

   • RSVP TCP Service Provider
     

   • MSAFD NetBIOS [\Device\NetBT_Tcpip...
     

   • MSAFD NetBIOS [\Device\NetBT_Tcpip...
     

   • MSAFD NetBIOS [\Device\NetBT_Tcpip...
     

   • MSAFD NetBIOS [\Device\NetBT_Tcpip...
     

   • MSAFD NetBIOS [\Device\NetBT_Tcpip...
     

   • MSAFD NetBIOS [\Device\NetBT_Tcpip...
     
     

   If the names are anything different from those in this list, the Winsock2 key is corrupted, or you have a third-party add-on, such as proxy software, installed.

If you have a third-party add-on installed, the name of the add-on will replace the letters "MSAFD" in the list.

If there are more than ten sections in the list, you have third-party additions installed.

If there are fewer than ten sections, there is information missing.


Note These entries represent an installation with only the TCP/IP protocol installed. You can have a working Winsock and see additional entries if another protocol is installed. For example, if you install NWLink IPX/SPX, you will see 7 additional sections, for a total of 17. Below is an example heading of one of the new sections:

MSAFD nwlnkipx [IPX]Also, each of the new sections that are created by installing NWLink IPX/SPX start with "MSAFD." Therefore, there are still only two sections that do not start with those letters.


If the Netdiag test fails, or if you determined that there is Winsock corruption by looking at Msinfo32, you must repair the Winsock2 key by using the steps in the next section.

Windows XP with Service Pack 2 instructions

To repair Winsock if you have Windows XP Service Pack 2 (SP2) installed, type netsh winsock reset at the command prompt, and then press ENTER.

Note Restart the computer after you run this command. Additionally, for computers that are running Windows XP SP2, there is a new netsh command that can rebuild the Winsock key. For more information, visit the following Web site:

http://technet.microsoft.com/en-us/library/bb457156.aspx Warning Programs that access or monitor the Internet such as antivirus, firewall, or proxy clients may be negatively affected when you run the netsh winsock reset command. If you have a program that no longer functions correctly after you use this resolution, reinstall the program to restore functionality.

Note If these steps do not resolve the problem, follow the steps in the next section.

Windows XP without Service Pack 2 instructions

To repair Winsock if you do not have Windows XP SP2 installed, delete the corrupted registry keys, and then reinstall the TCP/IP protocol.

Reset Winsock for Windows Vista

To reset Winsock for Windows Vista, follow these steps:

1. Click , type cmd in the Start Search box, right-click cmd.exe, click Run as administrator, and then press Continue.

2. Type netsh winsock reset at the command prompt, and then press ENTER.
   
   Note If the command is typed incorrectly, you will receive an error message. Type the command again. When the command is completed successfully, a confirmation appears, followed by a new command prompt. Then, go to step 3.

3. Type exit, and then press ENTER.

Did this fix the problem?

Check whether Winsock is reset. If Winsock is reset, you are finished with this section. If the Winsock is not reset, you can contact support.