Can i use the provided default ETM SSL certificates for secure communication?

No!

ETM provides several default, self-signed SSL certificates for secure communcation.
Those are meant for convenience at startup and/or development purpose only.
Please note that those certificates also have an expiration date.

You must not use them in productive environments.
Please create your own certificates via System Management - Communication - SSL certificates.
See product help for further details.
We also recommend to read our security guide line.

That applies to any feature where secure communication is used e.g. https communication with Desktop or Mobile UI, ULC UX, but it also refers to MXProxy or OPC UA communication.

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Engineering, Redundancy, Connectivity, Archiving, Distributed Systems, Programming / Scripting, User Interface, Installation / Configuration, Alarming, Special Functions / Features, PVSS, WinCC Open Architecture, Renaming, Activating Siemens Helpdesk, Activation Siemens Helpdesk, HMI, Ultralight, Mobile App, Security, User Days, Reporting, Continuous delivery, BIRT, Device Management, Desktop UI, C# API, Modbus, S7+, SmartSCADA, TLS Gateway, OOP, CSS, Support, 3.16