If some computers are bypassing Dansguard Proxy then your IT department needs to investigate and resolve this problem. Matters like this cannot be discussed on a public forum because it might reveal weaknesses that may be exploited by others.
If you are trying to obtain information on how to circumvent Dansguard Proxy then you have come to the wrong place.
The best way to tackle this sort of problem is by policy rather than technology. There are always clever people who will circumvent technology. Prepare a data usage policy that makes it clear what is allowed and what is not; apply this policy rigorously with the ultimate sanction of dismissal for offenders.
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