[Firebase/Core][I-COR000020] Error posting to Clearcut: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out."

Question

I am using Firebase for push notifications in iOS.

I am firing notification from Firebase console. How can I test notification using FCM registration token?

New Message Target-User Segment-Add Target- iOS App

I am sending message and response is displaying in logs.

{
"collapse_key" = "Bundle Identifier";
from =;
notification =     {
    body = Test;
    e = 1;
  };
}

I follow steps from the Migrate FCM doc.

I am getting this response but not able to see any notifications and I am getting also one error:

[Firebase/Core][I-COR000020] Error posting to Clearcut: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo={NSErrorFailingURLStringKey=https://play.googleapis.com/log, NSErrorFailingURLKey=https://play.googleapis.com/log, _kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-2103, NSLocalizedDescription=The request timed out.},

I am not able to understand what this error means, and why I am not getting notification and I am getting response.