Firstly, you should not be printing out the HTTP/1.0 200 OK message yourself. CGI is not HTTP. The first line your script outputs should be that Content-Type line. Everything else looks fine. Be sure you have autoflush turned on ($|=1). If you continue to have problems, it's likely with your IIS/Perl setup. I don't know how much use we can be, since mostly this site is about Perl as a language. If this is ActivePerl, have you contacted ActiveState or taken a look at their support site?