TRB256 WebUI not loading on airgapped network

[foggy0400]

Hi Teltonika community,

I’m currently trying to remotely administer a TRB256 that is connected to a private mobile APN. This mobile APN is located behind a firewall that does not allow it to connect to the general Internet - hosts on the APN can only communicate with other hosts on the APN. I am trying to use a PC connected to the APN to access the WebUI interface of the TRB256, but the page does not load, instead displaying a blank screen.

I used dev tools to have a look at the network traffic produced by the browser when trying to load the WebUI, and the only element that failed to load was ol.js, as this file appears to be hosted on a third-party server on the internet, which this PC does not have access to. I’ve attached a screenshot of the network log below.

Is there a way to configure the WebUI to be available when your PC does not have general access to the internet and cannot load ol.js?

[Marija]

Hello,

Could you please confirm the firmware version currently installed on your device?

Additionally, please let us know if you can log in to the device via CLI/SSH.

Best regards,

[foggy0400]

Hi Marija,

The TRB256 is currently running firmware version TRB2M_R_00.07.12.

I am able to log into the device over SSH from the PC on the private network, it’s just the WebUI that isn’t working on the private network.

[Marija]

Hello,

Thank you for confirming that.

Could you please also check the Console in the Dev Tools and attach a screenshot if there are any errors when you try to load the WebUI page?

Best regards,

[foggy0400]

Hi Marija,

This is the DevTools console when I attempt to load the WebUI - it does appear to be due to failing to load the ol.js file.

Cheers

[Marija]

Hello,

Thank you for providing the information. I have forwarded it to our developers and will get back to you as soon as I receive any updates from them.

Thank you for your understanding and patience.

Best regards,

[Marija]

Hello,

I have sent you a form to fill out. Once completed, I will contact you privately regarding this issue. For ticket ID please use “11837”.

Best regards,

[Marija]

Hello,

Are you still experiencing this issue? Have you received the emails from us?

Best regards,

[foggy0400]

Hi Marija,

Yes, I received your emails and have been talking to the support engineers - many thanks for putting me on to them.

[Marija]

Hello,

Could you please confirm if your issue has been resolved? If so, could you kindly share the solution here so that others experiencing the same issue can benefit from it?

Also, let me know if you need any further assistance.

Best regards,

[foggy0400]

Hi Marija, I haven’t been able to resolve the issue yet but I am continuing to talk with support. I will post in this thread once the situation is resolved.

Cheers,

[Marija]

Hello,

Thank you for letting me know. I will be waiting for your feedback.

Best regards,