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how to fall back to the main wan interface after the main interface becomes available on RUT240?

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Hello.
RUT will automatically switch from the backup WAN to the main WAN, when the interface becomes available. 
Regards, Igor.
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Thank you Igor, however in most cases it doesn't happen automatically neither on RTU240 nor on RTU950. In many cases it stays on the Mobile fail-over interface indefinitely. It works slightly better if ZeroTier VPN is removed from the packages but still not reliably. The latest f/w is used on both RTUs.
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Hi Igor,

We are also having this problem where the RUT240 is not returning to the Main WAN after it is available, it will remain on the 4G Failover.

When we disconnect the 4G Antennas, this fails the 4G connection and the RUT240 will use the Main WAN.

However it will not switch from the 4G to the Main WAN if the 4G connection is working well.

This is a large problem as 4G data is quite expensive and we want to use it only as a failover for customers not for extended usage, we have done a test and for over 30 minutes there was no switch back to the Main WAN.
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Hello.

Sorry for late response

I checked it on the latest firmware and it works.

When the connection is restored to the main connection, the router switches from backup WAN to main WAN without any problems.

Please update your firmware

https://wiki.teltonika-networks.com/view/RUT240_Firmw..

Regards.