Why too many FTP connections are going in CLOSE_WAIT state ?

Solution Verified - Updated -

Issue

  • Too many FTP connections are going in CLOSE_WAIT state and the number keep increasing.
  • Due to this users are unable to connect to FTP server and server performance is going down.
user@HOSTNAME] $ cat sos_commands/networking/netstat_-neopa |grep -i close_wait
tcp6       1      0 192.168.1.35:21         192.168.1.1:61744       CLOSE_WAIT  0          4150607    14023/vsftpd         keepalive (7044.60/0/0)
tcp6       1      0 192.168.1.35:21         192.168.1.1:60142       CLOSE_WAIT  0          4154744    14424/vsftpd         keepalive (7110.13/0/0)
tcp6       1      0 192.168.1.35:21         192.168.1.1:61935       CLOSE_WAIT  0          4156420    14353/vsftpd         keepalive (7077.36/0/0)
tcp6       1      0 192.168.1.35:21         192.168.1.1:60793       CLOSE_WAIT  0          4162021    15251/vsftpd         keepalive (7142.90/0/0)
tcp6       1      0 192.168.1.35:21         192.168.1.1:62918       CLOSE_WAIT  0          4167866    15741/vsftpd         keepalive (7175.67/0/0)
tcp6       1      0 192.168.1.35:21         192.168.1.1:62670       CLOSE_WAIT  0          4150914    14232/vsftpd         keepalive (7077.36/0/0)
tcp6       1      0 192.168.1.35:21         192.168.1.1:60551       CLOSE_WAIT  0          4156120    14745/vsftpd         keepalive (7142.90/0/0)
user@HOSTNAME] $

Environment

  • Red Hat Enterprise Linux (All Version).
  • FTP client / server setup.

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