I have a rather complicated situation where i am trying connect to an OPC UA server (Flexy102) connected to a private network provided by a private APN sim, without VPN. The IP is fixed and there is a NAT.
When connected through LAN, OPC UA client can connect.But when I try the same on the WAN, the OPC UA client cannot establish a connection to the default port 4840, which is allowed through the firewall.
Currently, I can ping from the server to the Flexy102.
Can anyone provide any advice? Thanks in advance.