unblock gmail

[Chris Lemire]

Hello, recently at school gmail chat has been blocked. I get the message below. How can I unblock it? How could they be blocking it?
   
      We're experiencing technical difficulties that may prevent your chats from being sent.
  My Name
  Connecting in 84s..
  Try now
  Set status here
    We're experiencing technical difficulties that may prevent your chats from being sent.




 
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