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FTP is not supported by NLB. The way I usually talk about this is that FTP is a "complex" protocol - there are multiple ports being opened; sometimes in different directions; and the load balancer needs to read the application layer data to determine what ports to allow and allocate to a target for each file transfer session.
NLB operates at layer 3 and layer 4 of the protocol stack. It doesn't look at the protocol to determine additional context - and that's what FTP requires.
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- AWS 공식업데이트됨 2년 전