I have come accross several cases of a corrupted or missing tcpip.sys file in the past few weeks, possibly the result of a failed windows update or third party software install. Update – Comments on the old blog indicated that this corruption may have been the result of malware / virus or its removal.
While easy to repair, this problem can have massive impacts on a system, virtually severing all levels of network connectivity. The fix should take you about 15 minutes and have you up and running in no time.
“unable to query host name” being generated when issuing the ipconfig command
The network status constantly showed “Network cable unplugged”
Could not start the ICS service
Using the LAN repair function resulted in Failed to query tcp/ip settings for the connection. Cannot proceed
LAN Support tab contained no data at all.
Fix / Solution
After troubleshooting we noticed that tcpip.sys was missing from our “Windows\ System32\ drivers” folder. Once we had identified this we were quickly able to source a copy of the file tcpip.sys and copy it into the above directy.
Once the computer is restarted it should regain all network connectivity.
We have attached a copy of tcpip.sys should you need to replace yours.
NOTE: Attached file (tcpip.sys) is for windows XP only