Use named user accounts, strong authentication, time-limited access, logging and approval for high-impact changes. Restrict each contractor to the required BMS controller, ports and site, and remove access when the job ends. A jump host or managed tunnel can centralise these controls.
Back up configurations and ensure local safety controls remain independent. Remote access should be tested for both function and isolation. The capability to connect is not permission to change every system, and the building owner, integrator and IT team should agree responsibilities before enabling it.
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What controls are needed before allowing remote maintenance access to HVAC, lighting or access-control systems?
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