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China is boosting internet censorship to keep people from accessing sites like Google.

HONG KONG (CNNMoney)

The action, confirmed by state media, has affected VPN providers including Astrill, Strong VPN and Golden Frog, which have all reported trouble with connectivity in China, particularly on mobile devices.

China has long blocked access to what it deems as sensitive Internet content -- political commentary, foreign news outlets and sites like Google. Access to Twitter, Facebook and YouTube are also blocked in China.

Taken together, the restrictions constitute the world's largest -- and most effective -- state-sponsored censorship program. The effort, officially called "Golden Shield," is more than a decade old.

Using a VPN allows Chinese and foreigners alike to circumvent the Great Firewall. For around $10 a month, users are able to access blocked websites, Gmail and even Netflix.

Chinese state media described the crackdown as a "healthy development" for the Internet, and one needed to shore up cybersecurity. It follows a move to tighten access to Google's email service that began late last year.

Should the VPN blackout persist -- or expand -- it would be a real headache for companies that rely on the workaround to conduct business.

Related: The Great Firewall of China is nearly complete

Winger Chen, who owns a food and beverage consulting company in China, has always "felt some frustration with [spotty connectivity]," but considers it to be "just part of doing business in China."

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China crackdown makes it harder to get around the Great Firewall