Why too many FTP connections are going in CLOSE_WAIT state ?
Issue
- Too many
FTPconnections are going inCLOSE_WAITstate and the number keep increasing. - Due to this users are unable to connect to
FTPserver 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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