Problem with indexing site based on IU

[linksor.com]

I have a problem with one site - google has indexed it with the following urls (dont know why):

www.domain.com/?s=word

Is this possible to block it and redirect to 404 page ?

I have checked it on version 5.4. and deluxe - such URL redirecs me to main page.

[Bruceper]

Honestly never seen that before. You could add a redirect in .htaccess for s= to the 404.html

RewriteCond %{query_STRING} s=$1
RewriteRule http://www.domain.com/404.html [R=301,L]

Will that work? I'm not sure, but it's close to workable.

What you should REALLY do is find out where they're getting these URL's from and stop it from the source.