title: Unit Testing, iOS, DTXProxyChannel error 1
body: <p>I sometimes start to get the following error</p>
  
  <blockquote>
    <p>2017-04-02 18:55:22.645937+0200 Stamps[730:111791] Connection peer
    refused channel request for
    "dtxproxy:XCTestDriverInterface:XCTestManager_IDEInterface"; channel
    canceled  Failed to run tests: The operation
    couldn’t be completed. (DTXProxyChannel error 1.)</p>
  </blockquote>
  
  <p>Last time, when this happened, I just did some random actions with clean my project, remove derived data etc., and it was fixed. Now, it happens again - just after a start of the app, it closes and log contains this error.</p>
  
  <p>What does it mean and is there any workaround here?</p>
  
  <p>I use XCode 8.3, Swift 3.1, test on device 6s with 10.3 installed.</p>