Which port should be forwarded for remote acceess from automation builder (over internet) to the AC500 plc ?
I have forwarded port 1200 for PLC LAN address (to some unused WAN port) because i saw (with TCPView) that this port is used when i was connected locally from automation builder to AC500 PLC but still i can't connect over internet (when i have used fixed dyndns IP address and WAN port in codesys communication parameters and also made firewall exception for this port).
Answers
The port of the vpn you setup between the plc and your engineering pc. Everything else is just very bad practice nowadays.
Try enabling ICMP traffic (ping), this opens a network discovery security risk of course. Suggest a secure tunnel for communications to mitigate this.
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