how to connect 800Xa system as a Remote Eng client through VPN tunnel? Which type of Hardware should have ?
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The simplest way is to use Remote Desktop (RDP) to log in to the DCS domain through the VPN and start up control builder on one of the 800xA nodes. Your remote client can be a simple and cheap laptop since it acts only as a terminal.
Trying to do anything else becomes a complicated nightmare of security through firewalls and trying to run RNRP over a VPN. (I'm not sure if it is even possible)