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If you see a callback to didReceiveConnectionFailure, instead of didReceiveServerFailure, and you are sure the issue is with credentials, then you may be incurring in a bug we have recently fixed.
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I'm not sure I understand your question properly, but le me explain a bit more how it works.

The openConnectionWithInfo will substantially continue trying to connect until either it succeeds or...

Hello,

you should receive an asynchronous exception on the clientConnection:didReceiveServerFailure: delegate callback. You can release the thread that is opening the connection by contextually...