Error (-50) can't authorize imac (again)

In three weeks time my mac seems to get deauthorized by it's self , when i try to authorize with my one and only acount i get a (-50) error network failure. My internet and so is working fine but i can't buy or play any itms song.
Bahhh

Apple responded with the solution i quote overhere.
1. Open Finder.
2. Click on "Macintosh HD."
3. Open the "Library" folder.
4. Open the "Preferences" folder.
5. Open the "SystemConfiguration" folder.
6. Locate the "NetworkInterfaces.plist" file in this folder.
7. Control-Click this file, then choose "Move to Trash" (from the context menu that appears).
8. Restart your computer.
9. Open "System Preferences" (in the Blue Apple menu).
10. Open "Network."
11. From the "Locations" pull-down menu, choose "New Location."
12. Name the new location, then click the "OK" button.
13. Close System Preferences.
14. Open iTunes.
15. From the pull-down "Store" menu, choose "Authorize Computer."
16. Make sure the Apple logo is selected.
17. Enter your Apple ID (the Account Name you sign in to the iTunes Store with), then your password, then click the "Authorize" button.
A dialogue box should display saying that the authorization was successful. If so, it should also list how many computers have been authorized to play and sync purchases made from this account.
At this moment all is well.
Thanks to Lindsey from Apple

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