What is a Proxy server and how is it disabled?

I'm having problems, and from reading these discussions, I suspect I have to disable my proxy server.
1) Before the most recent OS upgrade, I was able to access iTunes Store only from my home ISP (Wildblue satellite), or if away from home, only when plugged into an ethernet wire. When I'm away from home, I can never access iTunes Store from wireless Airport connection -- no matter what hot-spot I'm at.
2) After the most recent OS upgrade, I have the same problems, except I can't even get on iTunes Store from home. iTunes program bombs as soon as I log into the store.
The solution suggested is to disable my proxy server. (System Preferences -> Networks -> Advanced -> Proxies)
But I have no "disable button" here. I have a choice of "Using a PAC file" or "Manual". If i change it to "Manual", it defaults back to "Using a PAC File". and it says "PAC File URL: http://wpad.wildblue.com/wpad.dat". I can change the URL but I wouldn't have a clue what to change it to.
There is also a checkbox: "Use Passive FTP Mode (PASV)" and it is checked. Should I uncheck this?
Do satellite connections, like my Wildblue ISP, require a proxy server?
Any help meandering through this dark maze of computer mumbo-jumbo is greatly appreciated. I just want to download things from iTunes again.
Francis

By default there is no proxy server activated in your network preferences so you must have at some point needed one or otherwise you would not have set it up.
The simple solution is to create a new network location for you to use when your out and about.
system preferences-->network-->location-->edit locations...
click the plus sign
title it with a name of your choosing, click done.
Then apply
This new location should have a blank set of network preferences.

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