How do i change my network proxy settings on iTunes?

Question

Hi,
I've been using a certain proxy to connect to the iTunes store on my PC iTunes.
Now, the proxy details have changed, i already update the new details on the Internet Options (Windows Control Panel) and now i'm trying to update the proxy settings on iTunes. But it not prompting for a new one like before, and i think it because i selected remember passwword previously.
How do i reset these settings so i can enter the new proxy settings. iTunes keeps on telling me to check my network connection.
Thanks in advance.

Answer 1

Authorization
iTunes Store- Authorize or deauthorize your Mac or PC.
In iTunes you use the Authorize This Computer or De-authorize This Computer option under the Store menu in iTunes' menubar. For Windows use the ALT-S keys to access it. Or turn on Windows 7 and 8 iTunes menus: iTunes- Turning on iTunes menus in Windows 8 and 7.
Deauthorization
You can de-authorize individual computers, but only by using those computers. The only other option is to "de-authorize all" from your iTunes account.
  1. Open iTunes on a computer
  2. From the Store menu, select "View my Account..."
  3. Sign in with your Apple ID and password.
  4. Under "Computer Authorizations" select "De-authorize All".
  5. Authorize each computer you still have, as you may require.
You may only do this once per year.
After you "de-authorize all" your authorized computers, re-authorize each one as required.
If you have de-authorized all computers and need to do it again, but your year has not elapsed, then contact: Apple - Support - iTunes - Contact Us.
For more information on authorization and de-authorization: iTunes Store- Authorize or deauthorize your Mac or PC.