Can a server setting keep a page from opening?

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http://serverfault.com – I have a page with the following form: <form name="form1" method="post" action="wrong_1.htm" target="_blank"> <input type="submit" name="Submit" value="A. Public / Community View "> </form> When the form is submitted, a page with the correct URL is opened as expected, but a 404 results. Then when I place the cursor in the address bar and enter, the page appears. This doesn't happen when the page is run locally, so I wonder if a server setting (url rewrite?) is getting in the way. I'm baffled. The server is Microsoft-IIS/6.0 (HowTos)