TCP/IP reset

RESOLUTION

To resolve this issue, delete the corrupted registry keys, and then reinstall the TCP/IP protocol.

To delete the corrupted registry keys, follow these steps.

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

1.	Restart the domain controller.
2.	When the BIOS information appears, press F8.
3.	Select Directory Services Restore Mode, and then press ENTER.
4.	Use the Directory Services Restore Mode password to log on.
5.	Click Start, and then click Run.
6.	In the Open box, type regedit, and then click OK.
7.	Locate the following registry subkeys: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Winsock HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Winsock2
8.	Right-click each key, and then click Delete.
9.	Click Yes to confirm the deletion of each key.
10.	Close Regedit.
11.	Locate the Nettcpip.inf file in %winroot%\inf, and then open the file in Notepad.
12.	Locate the [MS_TCPIP.PrimaryInstall] section.
13.	Edit the Characteristics = 0xa0 entry and replace 0xa0 with 0x80.
14.	Save the file, and then exit Notepad.
15.	In Control Panel, double-click Network Connections, right-click Local Area Connection, and then select Properties.
16.	On the General tab, click Install, select Protocol, and then click Add.
17.	In the Select Network Protocols window, click Have Disk.
18.	In the Copy manufacturer's files from: text box, type c:\windows\inf, and then click OK.
19.	Select Internet Protocol (TCP/IP), and then click OK. Note This step will return you to the Local Area Connection Properties screen, but now the Uninstall button is available.
20.	Select Internet Protocol (TCP/IP), click Uninstall, and then click Yes.
21.	Restart your computer, and then select Directory Services Restore Mode as mentioned in steps 2 - 4.
22.	In Control Panel, double-click Network Connections, right-click Local Area Connection, and then select Properties.
23.	On the General tab, click Install, select Protocol, and then click Add.
24.	In the Select Network Protocols window, click Have Disk.
25.	In the Copy Manufacturer's files from text box, type c:\windows\inf, and then click OK.
26.	Select Internet Protocol (TCP/IP), and then click OK.
27.	Restart your computer.

After you reinstall TCP/IP, install Microsoft Windows Support Tools, and then run the Netdiag and Dcdiag tools to verify that the domain controller is functioning correctly. To do this, follow these steps:

1.	Insert your Windows Server 2003 CD-ROM in your computer's CD-ROM or DVD-ROM drive.
2.	Click Start, click Run, type DriveLetter:\Support\Tools\suptools.msi, where DriveLetter is your CD-ROM or DVD-ROM drive, and then click OK.
3.	Follow the instructions on the screen to complete the installation of Windows Support Tools.
4.	At the command prompt, locate the folder where the Support Tools were installed. By default, this folder is C:\Program Files\Support Tools.
5.	Type dcdiag /v for domain controller diagnostics, and then address any errors.
6.	Type netdiag /v for network diagnostics, and then address any errors.

XP: http://www.speedguide.net/read_articles.php?id=1539

Manual method to reset TCP/IP

The NetShell utility (netsh) is a command-line scripting interface for configuring and monitoring Windows XP networking. This tool provides an interactive network shell interface to the user.

In Windows XP, a reset command is available in the IP context of the NetShell utility. When you run the reset command, it rewrites pertinent registry keys that are used by the Internet Protocol (TCP/IP) stack to reach the same result as the removal and the reinstallation of the protocol.

SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
SYSTEM\CurrentControlSet\Services\DHCP\Parameters\

    

Command usage

netsh int ip reset [log_file_name]

To manually run the command successfully, you must specify a file name for the log where actions that are taken by netsh will be recorded. For example, at a command prompt, type either of the samples that are listed in the "Command samples" section. The TCP/IP stack will then be reset on a system, and the actions that were taken will be recorded in the log file, Resetlog.txt. The first sample creates the log file in the current directory, while the second sample creates a path where the log will reside. In either case, where the specified log file already exists, the new log will be appended to the end of the existing file.

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.

Command samples

netsh int ip reset resetlog.txt
netsh int ip reset c:\resetlog.txt