Hi Žygimantas,
thank you for your reply. I made some further tests.
I removed the existing hub (even if LAN forwarding and routes were already ok) and created a new one. The firmware is the latest available (TRB1_R_00.07.02.7)
I verified that the ETHERNET/SERIAL converters connected to the TRB140 have a gateway section in their configuration parameters.
I set the IP address of the TRB140 in these devices and this fixed the problem.
After that I made some tests with the plant supervisor (which can be accessed using HTTPS).
It is equipped with two ethernet connections: LAN1 and LAN2.
LAN1 is already in use and regularly working for both local and remote access.
I wanted to add a "parallel remote access" to it using the TRB140 and connecting it to LAN2 port.
In the configuration panel of the plant supervisor there is the possibility of setting one gateway only. Assigning the gateway to LAN2, the connection works, leaving the original gateway configuration to LAN1 I'm not able to access it using TRB140 VPN hub connection.
Anyway, I'm able to access it using RMS Connect (HTTPS). Does it make sense for you?
Is there anything I can do for enabling the connections from VPN without the need of using RMS Remote connection?
Thanks in advance for your support.