BEIJING—China fired a fresh regulatory shot at its tech giants on Monday, telling them to end a long-standing practice of blocking each other’s links on their sites, or face consequences. The comments, made by the Ministry of Industry and Information Technology (MIIT) at a news briefing, mark the latest step in Beijing’s broad regulatory clampdown on some of the country’s largest companies. China’s internet is dominated by a handful of technology giants that have historically blocked links and services by rivals on their platforms. Restricting normal access to internet links without proper reason “affects the user experience, damages the rights of users and disrupts market order,” said MIIT spokesperson Zhao Zhiguo, adding that the ministry had received reports and complaints from users since it launched a review of industry practices in July. “At present we are guiding relevant companies to carry out self-examination and rectification,” he said, citing instant messaging …