Cannot login with port 21
i have a vps on centos 7. which i setup using tutorial from DO
using same tutorial i setup 2 more vps on same and different server. now i cant login to this server using port 21. but i can login with port 22 easily. i check my firewalld then enable port 21 also. reboot server also. nothing working. can anyone help me why this could happen?
same configure used on other vps where i can login with both port
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