I get Kwlan was unable to configure wlan interface using iwconfig and Kwlan was unable to Release IP address after I go from one WiFi spot to another. Kwifi starts up at home when I boot my laptop, but does not connect after I get to another wifi spot. The laptop has not been shutdown while in transit. It does not help to turn off Kwifi and start it up again. Kwifi will work if I reboot the laptop.

Maybe I need to know how to release the IP address from the command line?

Dell Latitude CPi 400 MHz PII 256 MB RAM running Knoppix 5.1.1