My internet works fine (Wi-Fi under proxy), but I couldn't connect my iphone to Itunes. When I try to connect it always says "We couldn't complete your itunes request unknown error occured (310)"

When I tried to re-install I-Tunes it returns with the following message "The system extension "/system/Library/Extensions/hpPlugInInit.kext" was installed improperly and cannot be used. Please try reinstalling it ot contact product's vendor for an update. I am a new user to Mac... I don't know what doen't it mean. Any routes to resolve the problems would be greatly appreciated.
thanks in advance

Hello m295,
The following article contains several troubleshooting steps that can help restore functionality to the iTunes Store on your mac.
Can't connect to the iTunes Store
http://support.apple.com/kb/TS1368
Troubleshooting on a Mac
If you haven't been able to connect to the iTunes Store, a software conflict or your internet service provider (ISP) may be blocking your access.
Update iTunes to the latest version.
If you have a firewall, your settings may be preventing you from connecting to the iTunes Store. To configure your firewall, please refer to the "Blocked by firewall" section in this article.
You may need to reset your keychain. Connection issues are occasionally caused by keychain issues. Click here to find out how to use Keychain First Aid to resolve any issues with your keychain.
If you are receiving a specific error message you may want to see, the "Specific Conditions and Alert Messages" section in this article as needed.
If the issue still persists, contact your internet service provider and confirm that the ports and servers in this article are enabled over your network.
Additional Information
If the steps above did not resolve your issue, be sure that your specific alert is not listed in iTunes: Possible iTunes Store errors. Then, if your issue is still unresolved, follow steps in iTunes: Advanced iTunes Store troubleshooting.
Cheers,
Allen

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Did you try all the suggestions mentioned here? iTunes Error 13019 during sync

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Unknown error occured (310) when trying to connect to itunes store

Unknown error occured (310) when trying to connect to itunes store

This is probably due to a connection error.
I fixed this by navigating this route:
Control Centre > Network and Internet > Internet Options > Connections Tab > LAN Settings > Untick proxy server box (if ticked).
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My internet works fine (Wi-Fi under proxy), but I couldn't connect my iphone to Itunes. When I try to connect it always says "We couldn't complete your itunes request unknown error occured (310)"

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