[R] PRET RETR somefile.rar
[R] 200 OK, will use beta for upcoming transfer
[R] PASV
[R] 227 Entering Passive Mode (127,0,0,1,208,159).
[R] Opening data connection IP: 123.123.123.123 PORT: 53407
[R] Data Socket Error: Connection refused
[R] Transfer Failed!

123.123.123.123 = bouncer_ip
beta is the slave running on master with bouncer_ip set in drftpd.conf.
transfers from all other slaves are working, only beta makes problems