HAProxy+Keepalived can't create a FTP session with Virtual IP

@johnb wrote:

Hi all,

FTP doesn’t seem to work when I connect to the Virtual IP (VIP), but when I connect to the local IP of one of the two Proxy’s it works fine.
I see it wants to connect, but when the FTP data port comes up (PASV) it stops.
SFTP works fine without a problem so I think it’s something with the passive FTP ports that aren’t being routed correctly?

Log Filezilla:

Status: Resolving address of lb.example.com
Status: Connecting to 192.168.1.10:21…
Status: Connection established, waiting for welcome message…
Status: Server does not support non-ASCII characters.
Status: Logged in
Status: Retrieving directory listing…
Command: PWD
Response: 257 “/” is current directory.
Command: TYPE I
Response: 200 Type set to I.
Command: PASV
Error: Disconnected from server: ECONNABORTED - Connection aborted
Error: Failed to retrieve directory listing
Status: Disconnected from server
Status: Resolving address of lb.example.com
Status: Connecting to 192.168.1.10:21…
Status: Connection established, waiting for welcome message…
Status: Server does not support non-ASCII characters.
Status: Logged in
Status: Retrieving directory listing…
Command: PWD
Response: 257 “/” is current directory.
Command: TYPE I
Response: 200 Type set to I.
Command: PASV
Error: Disconnected from server: ECONNABORTED - Connection aborted
Error: Failed to retrieve directory listing

My setup:
I have two HAProxy servers with Keepalived on them with a VIP.
Behind the two HAProxy servers are two FTP Servers.

Can anyone help me with finding and if possible solving the problem?

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