message "nf_ct_ftp: dropping packet" is output on ftp server

Solution Verified - Updated -

Issue

  • The following message had been output on a server the vsftpd is working.
    kernel: nf_ct_ftp: dropping packetIN= OUT=eth1 SRC=<IP Address> DST=<IP Address> 
      LEN=90 TOS=0x00 PREC=0x00 TTL=64 ID=14581 DF PROTO=TCP SPT=21 DPT=42213 
      SEQ=6214852 ACK=4228557922 WINDOW=115 RES=0x00 ACK PSH URGP=0 UID=0 GID=0
  • What is the the root cause by which this message is output?

Environment

  • Red Hat Enterprise Linux
  • Tracking ftp with conntrack

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