While not an officially supported solution, and you'll have to revert back to the original, unextended, cables for any support if you start having problems, yes, you can extend the cables with a normal Cat6 cable and an HDMI extension cable. You may find though that there is too much voltage drop to power the camera for longer distances. If this is the case for your installation, you will need to use an external power supply for the camera. It's also recommended if using an external power supply that you don't connect the power conductors in the control cable.
See this thread for some examples of other people who have extended the HDMI and control cables.
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Wayne -- Please remember to rate responses and to mark your question as answered if appropriate.
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.