Before we jump towards the resolution of the Security software verify that the issue is caused by Security software’s interference, for which follow the arranged steps:
Check if your computer’s time, date and time zone is correct or not.
Secondly make sure you are logged in as administrative user
The iTunes version installed on your device should be latest.
The latest updates of Operating system should be installed
The modem firmware and the router should be updated.
Connect your PC with the iTunes without using an internet proxy.
The built in diagnostic in iTunes can assist your PC to run in order to check the connections as well as the created reports.
If security software is making any procedure difficult then update your security software by following the course of action stated below:
On your PC click the start button and see which programs are available in the menu.
On the lower right corner of the task bar check the notification area present for security applications.
Under the control panel > add/remove, browse the installed application.
If you are on a Mac, go to Applications and then open the Utilities to check which security software is installed and updated their versions.
After updating the software configure it correctly so that your
iTunes can conveniently contact Apple.