Failed to initialize broker connection.Failed to initialize MQTT client: -10

I'm working in nrF9160 dk board I'm working in cellular IOT exercise. I successfully builded and flashed and received the output also till yesterday. but from morning I'm getting this issue can help on this issue!
This is which I got worked yesterday.

But from today morning I'm getting this issue. I didn't do any changes but I'm getting Failed to initialize broker connection. Failed to initialize MQTT client: -10.

what I need to do what is the issue can you assist me!

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