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ftp サーバーに "nf_ct_ftp: dropping packet" メッセージが出力される

Solution Verified - Updated -

Issue

  • vsftpd が起動しているサーバーで以下のメッセージが出力されました。
    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
  • このメッセージが出力される原因は?

Environment

  • Red Hat Enterprise Linux
  • Tracking ftp with conntrack

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