RUT M30 internet connection is disconnected

Networking Solutions
1

Hello,

I need help with a problem:

My Teltonika RUT M30 always loses its internet connection after 01:59:40 hours.

The router remains logged into the 5G network, but the internet connection is disconnected.

Only a reboot helps for the next 2 hours. The error only occurs when my Synology NAS 916+ is online in the LAN. Reproducible!

When the Synology is not online in the LAN, the Internet connection remains active for 24 hours or more.

In the event log, I only see:

3600 2026-01-07 18:50:14 Mobile Data Network InfoMobile data disconnected (internal modem)

For error analysis, all services on the Synology have already been stopped (OpenVPN, DDNS, Docker VMs). Without success.

RUT M30 Config is out of box and testing with auto APN and manual APN.

Unfortunately, troubleshooting is very time-consuming because it always takes me 2 hours to reproduce the error.

In which logs can I find more information that could help me?

The next step would be to replace the router itself. I have the same one installed in my motorhome. However, I would like to avoid this, as the router is complex to install there.

The following FW have been tested:

RUTM_R_00.07.20

RUTM_R_00.07.18.3

3

Hello,

Since you do mention that the issue is reproducible, we could try the following approach:

  1. I send you a form to fill out, after which we will continue our conversation (troubleshooting) in a different communication channel (to avoid leaking any sensitive information)
  2. I’ll first collect the troubleshooting file from your device after the issue has been reproduced, so it’s visible within the logs.
  3. I’ll then attempt to check the settings of the device. If nothing out of the ordinary is found, I’ll see if there’s perhaps a new modem firmware I could try upgrading to, which may help with this particular situation.
  4. If step #3 will not help, I’ll simply escalate this matter for our R&D to investigate further.

If it comes that we need to proceed with step 4, and step 2/3 won’t be enough, I’d like you to know that it may take a while, as our R&D are very busy.

If this is okay with you, I’ve sent you the form to fill out. In the Ticket ID field of the form, enter the numbers 17281 which will be your ticket ID. For the description and contat info, they should be pretty self-explanatory.

Thank you,
M.

4

Hi Matas,
I filled out the form last Friday but haven’t received any feedback yet.
I just sent my error description again. In the meantime, I have also tested with port 443. Same error.

5

Hi there,

I’ve reached out to you already, please reply to the e-mail you’ve received just so I’m sure you’ve received it.

Thank you,
M.