When you say the port is enabled did you telnet or console into the VG and enable it? (just curious) Is the corresponding Lamp on the front of the VG lit even before a phone is connected? If so the wiring from the RJ21 cable or cross-connect may have a short. This will give a permanent off-hook or "lockout" fast busy.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.