html - (failed)net::ERR_CONNECTION_RESET on large file upload php

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Html Code:

<form id="fileuploadform" method="post" name="fileuploadform" enctype="multipart/form-data" class="form-horizontal">
    <div class="form-body">
        <div class="form-group">
            <div class="col-md-12">
                <div class="form-group col-md-4">
                    <label class="control-label font-blue-madison bold">Select the File To Upload:</label>
                    <input type="File" name="test" id="testfile">
                    <input id="sss" type="button" value ="sss" name="test_uploa_form">
                </div>
                </div>
            </div>
        </div>
    </form>

Source