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Why I get this error message "Failed to connect to the server!" when synchronizing?

Click the Synchronize button inthe Outlook, an error message pop up.

Please check the followings:

  1. WinPST Server hasn't started. Please start it to solve this problem;
  2. The listening port of WinPST Server is different from that of the Client (Default: 8088). Please open the Outlook, click Settings button on toolbar, select Connection tab, then specify the Port to be the same as the listening port of the server. If there's a network firewall, you need to make sure this port is available;
  3. There may be a network problem preventing you from accessing the network where you want to connect WinPST Server, please contact your administrator to solve this network problem.

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