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You change in httpd.conf in Apache and also in functions/functions.php

httpd.conf:

Change Listen 81 to Listen XXX

functions/functions.php:

$wsdl_url   = 'http://localhost:81/MPExtControlWS/service.asmx?WSDL';

Change 81 to XXX

XXX = Port

Restart Apache...I think that this should do it.

The port change is because users might have a webserver already running, and that would lead to a problem.