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Hi, I've got an RUTX09 and TRB140 both connected to sites which use the same controller that hosts webpages and neither can get past the login page when using the remote HTTP(S) function. All works correctly when I connect via VPN and access the webpage of the controllers. I've also updated the firmware of the TRB140 to the latest version and still has the same issue.

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Hello,

Could you check if the devices are directly assigned with public IP addresses and are not under CG - NAT?

Best regards,
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The SIM IP is different to that when I connect via VPN and use whatsmyip so presumably means it is under CG - NAT. However, wouldn't that be the case for all non fixed IP sim cards?
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Also, ignore the screenshot as I don't have the same errors on the other device.
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Could you provide more details about network, a topology image?
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It is simply RMS remote HTTP(S) to TRB140 gateway directly plugged into a controller. One possible issue is the controller is rejecting any connections from RMS due to a connection from a non trusted source. Would it be possible to be issued with the relevant teltonika SSL certificate?
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In some instances, the web interfaces of devices behind Teltonika gateways and routers might be rejecting connections or not providing full features of their interfaces, as from the controller's side, the connection is made from a proxy. I would suggest to try creating a VPN HUB as this way you should have no issues. The following link provides introduction to and instructions on how to set up a HUB:

https://www.youtube.com/watch?v=dfAudZR2wPY 

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I can already do that, which is fine for me as an engineer, but the webpage access is for clients. I've taken a log from the controller which is logging the web server actions. It appears to be failing the handshake, but I'm a novice and have no clue what I'm looking at. I'll attach the file to the question.