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Hello.
Looking at the logs, it seems that the connection is using FTP passive mode, but are the port numbers allowed by Lightsail's firewall correct?
If no port number is set on the FTP server side, one of the ports between 49152 - 65534 will be used.
https://support.cpanel.net/hc/en-us/articles/360055135534-What-ports-should-I-open-in-my-network-firewall-
0
FTP requires ports 20 & 21 to be open, and it looks like your security group is only allowing traffic on 21.
https://learningnetwork.cisco.com/s/question/0D53i00000Ksx4LCAR/why-does-ftp-have-2-port-numbers
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