How to control the waiting time of the server to response

Morning All

     When I wanted to connect to the server (overseas) in our organisation,Sometimes I cannot immediately access the server.

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After It last tweenty miniutes or more than , It  pop-up dialog as below.

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  How can I control the waiting time from the server to response..

  or reduce the maximum number of seconds to wait for the server, no matter online or offline..

  or Reduce the number of times to re-connect the server...

Any ideas?

Many Thanks