Our server connect to ISPmanager from outside to server to port 21, 25, 110, 80... for check services and this can not be skipped.
Also installer from server connect to service.ispsystem.net port 80 for run check procedure from outside.
You can break installation by control+c key when it "checking www..." (because all software installed and configured before checking) and delete mgrtest user in ISPmanager.
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