Centos 7 vsftp sets passive mode and enables relevant port mapping, but still cannot use passive mode

centos 7 vsftp sets passive mode and enables relevant port mapping, but still cannot use passive mode

pasv_enable=YES
pasv_min_port=30000
pasv_max_port=30010

when using a client like fileZilla, the status disconnects when it reaches PASV

what is the general way to debug in a situation like this?

Mar.05,2021
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