Hello. Thanks for the response. No the ip is correct, because we have private VPN connection with IPSEC with the provider, so the SIM CARDs, can reach us over the private network. This works 100% because we are using this for other FTP services and some other devices that can reach us with that IP.
Network TOPOLOGY
WS 2019 - IIS - IP 10.0.150.10 for testing purposes without any FW on the windows.
Then the router with IPSEC over APN with the provider, every port is allowed to our VLAN through router FW, again for the testing purposes...
Then the providers side, with RADIUS and everything
Then the teltonika modem.
Do you know if anything is comming to RS232 and you have this setup, does this mean that the teltoinka is forwarding to that address and port? because in the wireshark on the server, there is nothing coming on this ip or port,... Thanks.