DNS error (or 404) with IE

I have a serious problem with a script that runs on a customer's webserver. The script is running on a secure server with https protocol.

I first encountered the problem when I used a header-redirection with not specifiying the full URI like

header("Location: script.php");

I know that i must provide the full URI so I changed that. Now I found that sometimes the error seems to occur on simple form posts if the form action does refer to a relative URL like:
<form action="script.php" method="post">

I have never seen this error on other webservers before. It occurs only sometimes if a form is posted. The Internet Explorer comes up the standard error page (saying there is a DNS error). I know that this IE-erropage might be misleading and this might not be a DNS error. But something must be wrong here.

The problem is not reproducable and I am really desparate because the customer blames my script and I suspect it might be a misconfiguration of the server.

Any hint will be appreciated

Marian

 

 

 

 

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