client communication error on Virtual Machine running on cloudstack

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I want to use terminal/console of ubuntu 14 installed on virtual machine running on cloudstack 4.6. I am able to use ubuntu 14 desktop normally but whenever I try to use the terminal from it, i get "Client communication error please retry later". Following is the screen shot of the error. error

I am using college network behind a proxy server, could that be a problem ? any suggestions ? Does anybody know where I am going wrong ?

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Quickest way to troubleshoot this - on the browser window that houses the broken terminal, do a view source. In there you'll find a URL direct to your console proxy server. Copy and paste that URL into a new window and see if you can hit it directly. I'm guessing a firewall issue...