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BEIJING — Fang Binxing is known here as the “Father of the Wall,” that is, the Great Firewall — the sprawling system of technological controls in China that has created a parallel online world, or “Chinternet,” where global favorites such as YouTube, Twitter and Facebook are blocked.

In fact, it’s fair to say that Mr. Fang is unpopular among quite a few of China’s hundreds of millions of netizens, though he does have his admirers, including among those who support the government’s large-scale efforts to “weiwen,” or maintain stability.

Just how unpopular he is was demonstrated again over the weekend when his New Year’s microblog greeting was promptly bombarded with messages telling him to “go to hell,” according to netizens (it wasn’t possible to read each message, but Mr. Fang’s post had been forwarded over 23,000 times at the time of writing).

Pithily, in one word repeated again and again, the critics said: “gun,” or “滚.” (The word literally means “roll,” or, in an officially accepted slang variation, “beat it.”)

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“Fang Binxing sends everyone New Year’s greetings! May all be joyful and successful in the Year of the Snake!” he posted on his Sina Weibo, or microblog, account, on Saturday, continuing with salutations to his university (he is the president of the University of Posts and Telecommunications in Beijing) and a poem.

“Yesterday, a university president wished everyone Happy New Year on his microblog account and the result was he got over 10,000 forwards saying ‘go to hell,’ ” He Bing, deputy director of the School of Law at the China University of Political Science and Law, posted to his nearly 395,000 followers on Sina Weibo.

“As long as people like this continue to be the presidents of universities there’s no hope for China,” Mr. He’s post continued. By Tuesday afternoon it had been forwarded about 3,700 times.

Mr. Fang acknowledged in an interview in 2011 that he had designed major parts of the Great Firewall. He is a lightning rod for protest among the Internet-savvy who want broader freedom of speech.

He’s had eggs and a shoe thrown at him, and in 2011 had to close his newly opened microblog after thousands of users left comments within hours — almost all of them critical, the populist newspaper Global Times noted.

“I regard the dirty abuse as a sacrifice for my country,” the newspaper quoted Mr. Fang as saying.

Attention is growing around the world on how the Chinese state uses the Internet, with The Washington Post reporting today on a new intelligence assessment in the United States. The newspaper writes that according to a National Intelligence Estimate, the United States is the target of “a massive, sustained cyber-espionage campaign” and that China is “the country most aggressively seeking to penetrate the computer systems of American businesses and institutions to gain access to data that could be used for economic gain.”

The Post is one of a number of U.S. news organizations, including The New York Times, that recently reported having been subjected to cyberattacks believed to have Chinese origins. (The Times has been blocked in China since running a story last year about wealth accumulated by the family of the outgoing prime minister, Wen Jiabao.)

Back in Beijing, Mr. Fang hasn’t posted anything since his New Year greeting, so it isn’t clear how he feels about the reaction to it. Meanwhile, word continues to circulate that more “upgrades,” or tightening, of the Great Firewall lie ahead.

In December, several overseas-based companies that provide VPNs to both non-Chinese and Chinese users in the country (a VPN, or virtual private network, enables users to get around the Chinternet, or “cross the Wall” as it’s known here, by logging on via overseas servers) said their services had been interrupted.

In what some read as a warning, Mr. Fang appeared to tell Global Times that overseas-based companies offering VPNs to people in China must register with the Ministry of Industry and Information Technology.

“I haven’t heard that any foreign companies have registered,” he said. Unregistered VPN service providers are not protected by Chinese law and any company running a VPN business should realize it has a responsibility to register, he said, according to Global Times.