Query String Problem in IIS 6.0 when only the name is specified from a name/value pai

I am testing a perl script IIS 6.0 that ran fine in IIS 5.0 and am having a problem. When I specify a query string with only one name with out a value IIS returns an error. An example of a URL that produces this error is as follows:

http://www.domain.com/cgi-bin/test.pl?admin

However, this will work fine if I use any of the following:

http://www.domain.com/cgi-bin/test.pl?admin=
http://www.domain.com/cgi-bin/test.pl?admin=1
http://www.domain.com/cgi-bin/test.pl?admin=1&load=2
etc...

I have not been able to find a setting in IIS 6.0 that is limiting this.

It looks to me like your code is the problem, not IIS. Of course, had you posted the error message maybe that interpretation will change.

Sorry, the error is a simple:

CGI Error
The specified CGI application misbehaved by not returning a complete set of HTTP headers.

The code is definately not the problem as it is extremely simplistic in nature:

print "Content-type: text/plain\n\n";
if ($ENV{'QUERY_STRING'} eq "admin") {
print "ok";
}

You can even try it, just save this code as test.pl and then load it from the browser with http://www.domain.com/path/test.pl?admin

You will notice that it prints out "ok" instead of nothing if you change the following line of code to:
if ($ENV{'QUERY_STRING'} eq "admin=") {

and change and url to :
http://www.domain.com/path/test.pl?admin=