Mikrotik SMS Send Error no such channel (6)

One of the many features of Mikrotik router is, to send SMS using GSM modem. Using this feature, we can send notifications of any event in the form of SMS to the user's mobile phone.

In today's tutorial, we will discuss an error message that many users get when sending SMS. The error notification is: -

Couldn’t perform action – no such channel (6)

Here is a screenshot of this error notification:

Mikrotik communicates with the modem using a specific channel and sends SMS through that channel. The user has to specify this channel number while sending SMS. If for some reason the mikrotik router cannot communicate with that channel, then this error notification is shown. Many users make a mistake in entering this channel number. Here, they assign the channel number of the USB port. One thing to note here is that , even though we select the modem's USB as the port when sending SMS, but the router basically uses the serial port channel number as SMS sending channel. Does not use channel number of USB port. So when we assign the channel number of the USB port, the router fails to send an SMS using that channel and shows the error message.

So the solution to this problem is, we have to use the channel number of the serial port. We will select USB as the port and assign the number for the channel of the serial port.

We can find out the channel number of a port from the "port list".

And we will get access to “Port List” from “System - Port” location.

After giving the correct channel, I hope it will not show any error notification.