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Our company recently set up a proxy server. As far as I understand, they want to apply some access policies to undesired sites, and log/audit the usage of the internet and generate employee internet usage reports. My question is related to the latter part. Before they were using a proxy server, they were also generating internet usage reports. At that point, what kind of contribution will the new proxy server make? Does it have further advantages on reporting internet usage?

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This cannot be answered. unless you give some indication of (1) which proxy, and (2) what solution was in place before. –  Richard Jan 25 '10 at 10:06
    
There was no proxy server before. I don't know what the previous method was. The only thing I know is they have inserted an automatic proxy configuration URL to web browsers on PCs, which is something like company.com/proxy/proxy.pac –  Mehper C. Palavuzlar Jan 25 '10 at 10:13
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It is much more likely that the proxy server solution will enable them to determine who the usage belongs to, rather than just where it was done (eg by PC name).

Of course, this does depend on what it is and what you had before, but typically some kind of user authentication will be used (quite possibly transparent to the user). This improves non-repudiation ("it wasn't me, I left my machine on when I went out to lunch") and enables clever rules ("let some people have this content but not you")

Unless someone is very bored they will almost certainly never waste their time looking at full logs. More likely they will look at exception reports (attempts to access blocked sites for example), and outliers (top 20 sites, top 10 users by volume or time on line, etc).

Depending on the law of the country you are in, you may be covered by data protection and/or human rights legislation which (in the UK for example) would mean you should at least be allowed to know what data is being collected, for what purpose, how long it is kept, and be entitled to see it (your data) for yourself. This does not stop them collecting it or using it, and asking awkward questions may call attention to yourself that you do not want, that's up to you.

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Without knowing the previous solution I can only make an educated guess, but I expect that they were generating the usage reports "by hand" from the raw data logged somewhere.

Given that this will be a lot of data, it could well be very time consuming. Has your company grown (in terms of number of employees) recently. If so then it might be taking a significant proportion of your sysadmin's time.

Having a proxy server will make this analysis much easier as it will generate more readable logs automatically.

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