Problem Posting bigger files to IIS with Chrome

i submit a simple file via POST Testform to itself on a windows authenticated website running on Win 10 Enterprise/IIS. Everything works fine with IE and FF.

With Chrome the upload works even fine with a file of 8kb. With a file of about 70kb i get a authentication required.

My testform index.php:

<!DOCTYPE html>
<html  lang="de" lang="de">
<body>
<?php
    echo '<pre>';   
    print_r($_FILES);   
    print "</pre>";
?>

<form enctype="multipart/form-data" action="./index.php" method="POST">    
    Upload File: <input name="userfile" type="file" />
    <input type="submit" value="Send File" />
</form>
</body>
</html>

php.ini:

post_max_size = 8M
upload_max_filesize = 8M

If i use anonymous authentication type for the iis-site everything works fine with chrome too. Any idea?

1 answer

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