Siemens SINUMERIK 840D sl Operating Manual page 50

Connection to the control
5.5 Establishing a modem connection
5. It is important that SSH is approved (see figure below).
Figure 5-17
6. As already mentioned, VNC still requires approval. This is done in expert mode.
Port 5900 for VNC must be opened (see figure below).
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"Security" > "Incoming calls" > "Internet protocols" tab
SINUMERIK Integrate Access MyMachine /P2P (PC)
Operating Manual, 11/2016, A5E39356962B AA