Fix: Thinkpad using Wireless LAN even when connected via wire

This morning, I noticed that my work laptop, a Thinkpad T60 running Windows XP, was using its wireless network connection, even though the machine was docked and plugged in to the wired LAN.  In Control Panel | Network Connections, the “Wireless Network Connection” showed “Connected,” but the “Primary Network Connection” showed “Disabled.”

Right-clicking the “Primary Network Connection” and selecting “Enable” from the context menu resulted in a “Connection Failed!” message in a popup window, with no further details on the problem.

I’m not sure how my “Primary Network Connection” became disabled in the first place, but I was able to re-enable it as follows:

• In Control Panel |  Network Connections, right-click on “Primary Network Connection” and choose “Properties”
• In the “Primary Network Connection Properties” dialog that appears, click the Configure button (near the top of the dialog).
• In the dialog that appears, if a message appears stating that the device is currently disabled, click the “Enable Device” button.

That fixed the problem for me.  The wired connection started successfully, and the wireless connection disconnected automatically (as it normally does when the wired connection is active).