it was working fine then it happened ,i deleted my node-red instance from IBM bluemix installed again ,it worked for sometime then i had the same error :"Error on connection for TTN application yo1989: Error: 14 UNAVAILABLE: Connect Failed"
Can you post the node red log from a node red restart please. Up to the error.
I don't understand? What do you mean ?
Just realised you are running on bluemix, sorry I don't know how to get the log on there.
where did you read at it was a common error?
Perhaps ask there how to fix it.