[Zope] urlopen works outside Zope, not inside

I have an External Method containing a reference to urlopen. The procedure that the Method represents works well when invoked from outside of Zope. However, within Zope I get the 10061 socket error, "Connection refused." Help or advice, please. Bill ------------ "It is the time that you have wasted for your rose that makes your rose so important."--St-Exupery