APIPA
 

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General Description

This article outlines methods of resolving issues with a 169.x.x.x IP address

Step by Step Instructions

This address results from a built in feature of windows called automatic private IP address(APIPA). When your computer is unable to find a DHCP server the APIPA service will assign itself a 169.x.x.x IP address. According to Microsoft, the APIPA service checks for a DHCP server every five minutes.

Releasing the IP address

  • Click on Start and click Run
  • Inside Run, type ipconfig /release to release the IP address
  • Then after the IP address is released, type ipconfig /renew

 

Disabling the Ethernet Adapter

  • Click on Start and right click on My Computer. Then click on Manage.
  • Click on Device Manager and then Network Adapters
  • Under Network Adapters, right click on your Ethernet adapter and select Disable.
  • Wait approximately 5 seconds and right click on it and click Re-enable.
  • This restarts the DHCP client and tries to obtain an IP address from the Network.

Check the Ethernet cable

  • Sometimes a bad Ethernet cable can cause your system to receive a 169 IP address, try changing out the cable for a new one.

Disable antivirus and firewall applications

  • Disable/uninstall any external firewall, antivirus, or spyware programs (eg. Norton Internet Security, McAfee Security Center, Trend Micro 2007, Webroot).
Note: If you do this, please refer to [KB002454] Installing McAfee Anti-Virus Home Edition to protect your computer.

 

Restarting the QoS packet scheduler Protocol

  • Click on Start and click Control Panel.
  • In Control Panel, double click on Network Connections and then Local Area Connection.
  • Click on Properties and uncheck QoS Packet Scheduler.
  • Click Ok and repeat the process.

 

Restarting the DHCP service

  • Click Start and select Run.
  • Type services.msc in Run and click Ok.
  • Find DHCP service and right click on it. Click on Stop.
  • Reboot the computer.
  • When the computer boots up, click Start and select Run
  • Inside Run, type the following: netsh int ip reset log.txt
  • Click Ok.

 

System Restore

  • Open Start and click on Programs and then Accessories.
  • Then click on System Tools.
  • Click on System Restore and select a restore point when you were not experiencing this problem.
  • Restore your system.
Winsock
  • Winsock Fix will reset all the settings back to their default state.
  • To download Winsock fix follow this link http://www.spychecker.com/program/winsockxpfix.html
  • Install winsock fix on your machine and reboot your computer

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How to use automatic TCP/IP addressing without a DHCP server

http://support.microsoft.com/kb/220874 

Routing Does Not Work When Multiple Adapters Use Automatic Private IP Addressing Simultaneously

http://support.microsoft.com/default.aspx?scid=kb;EN-US;244268