A method for operating, monitoring and/or configuring an automation system of a technical plant from a remote device may include a control software ensuring that the software processes of an operating and monitoring software and/or a configuration software relevant for a communication via a public network are terminated. After setting up a secure communication link from the device to the automation system via the public network, an endpoint of the communication link in the remote device is assigned a network address and the software processes of the operating and monitoring software and/or configuration software relevant for a communication via the public network are started. The data packets sent by the operating and monitoring software and/or configuration software for operating, monitoring and/or configuring the automation system are diverted to the network address by the control software.