If you haven't already done so, don't forget to delete any trace files and turn off tracing by removing the command line parameter in the batch file.

To turn off Keep-Alive, find the relevant line in your httpd.conf file and change it to Keep-Alive off.

The plug-in also lists the file and line where the error occurred (though it might be off by a line or two, so make sure to review the lines before and after the problem as well).