Are there any specific restrictions on downloading? I'm not sure about this, but there must be a setting in his system. If he thinks you are blocked by malicious downloads, then he can't help it. This kind of thing happened in my school, but I didn't block it after downloading more than a dozen articles. Please contact the school library. It may be that your school's cnki database was downloaded "maliciously" as a whole, resulting in being blocked. Please contact the library for details! !