Yesterday found that the company server being poisoned half a month, abnormal reminding email is not in their hand, alive when the chicken, half month is normal business running, if it weren’t for yesterday exploded with CPU can’t found dead, snapshot backup after reshipment system didn’t even find FTP death, active passive automatic all tried and can access to the directory but unable to traverse the file, is the problem of port:
First go to the server to open the firewall 80 (HTTP), 3306 (SQL), 443 (HTTPS), 21 (FTP) these open ports are open, at this time the website can normally access, but FTP still can not get the file as usual;
The server is ftPserV, but it has been changed to passive and port:
Then add these two ports to your firewall (note that both inbound and outbound rules are added) :

Filezilla for the client, change the mode to passive mode:

It turns out that it still doesn’t work. It turns out that the security group of Aliyun also needs to match these ports (both entering and leaving should be matched) :

At this point, FTP is perfectly linked.