You ask your IT staff. They know more about your setup than anyone here can. Of course it's possible that they have deliberately blocked web access to stop people wasting their time. In that case any attempt to circumvent the restriction would probably result in dismissal.
I'm afraid that no-one here is going to tell you how to circumvent restrictions put in place by IT staff. Apart from the fact that I used to work in such a position myself, I wouldn't want to be responsible for you losing your job. Never underestimate your IT staff - they know exactly what you are up to.
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