Error processing request

The server enountered a problem while trying to load or parse an XML request
The XML source was:
http://lt01.nypl.org/lizardtech/iserv/calcrgn?cat=NYPL&item=/5-31-2006/g91f031_006fd.sid&wid=420&hei=400&plugin=false&style=default/view.xsl&browser=win_ns6
The exception was:
javax.xml.transform.TransformerException: java.net.ConnectException: Connection refused: connect

You may try the request again, or correct the problem administratively