In an effort to protect your privacy, iTunes uses the Secure Sockets Layer (SSL) protocol when you sign in to the iTunes Store. The SSL protocol uses port 443, the date and time, and other information from your computer to function as expected. The troubleshooting steps below will address the most commonly incorrect information that SSL and the iTunes Store require; this should resolve the issue and the alert should no longer appear.
Set your date and time
Check your computer's date, time, and time zone. If they are not correct, set the correct date, time, and time zone.
On Windows
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- Click Start and then click Control Panel. 
	
- Click "Date, Time, Language, and Regional Options" (Windows XP) or "Clock, Language, and Region" (Windows Vista & Windows 7). 
	
- Click Date and Time. 
	
- Click the Date & Time tab.

	

	 - Make sure that the date and time settings are configured to use the current date and time and then click OK. 

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On Mac OS X
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- From the Apple () menu, choose System Preferences. 
	
- In System Preferences, click Date & Time. 
	
- Enable the option to "Set date and time automatically" if it is not.

	

	 - Click the Time Zone tab and adjust the time zone to match your current location. 

Further troubleshooting steps (for Windows only)
Correctly configure Internet Options
- 
	
- Open Internet Explorer. 
	
- On the Tools menu, click Internet Options. 
	
- Select the Advanced tab. 
	
- Under the Security section, look for Use SSL 3.0 and Use TLS 1.0. Make sure at least one of those two checkboxes is selected and click OK. (You can select both checkboxes). 


Update, configure, disable, or remove security software
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- If you are able to sign in to secure websites in your web browser but iTunes is unable to do so, security software may be interfering with the normal operation of iTunes. If this is the case, follow the steps in iTunes for Windows: Troubleshooting security software issues. 
	
- If you are also unable to sign in to secure websites in your web browser, follow the steps in Microsoft's article You cannot log in to or connect to secured Web sites in Internet Explorer. 

Learn more
If the issue is still unresolved, or you found this article looking for assistance with another alert, please see the following articles:
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- Can't connect to the iTunes Store 
	
- iTunes for Windows: Network Connectivity Tests 
	
- iTunes: Troubleshooting iTunes Store on your computer, iPhone, iPad, or iPod 
	
- iTunes Store: "An unknown error occurred (-9808)"