FTP Error Encountered: 421.

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux 5 or 6

Issue

  • Occasionally the following error is observed in var/log/messages on the FTP server: 
FTP Error Encountered: 421.

Resolution

  • Check the limit of the vsftpd service:
# grep processes /proc/$(pidof vsftpd)/limits
Max processes             1024                 967610               processes
  • Manually increase the maximum number of processes limit for the vsftpd process.
  • Edit /etc/rc.d/init.d/vsftpd and add the following 2 lines, around line 31 :
start() {
        # ulimit increase      
        ulimit -u 10000
  • Component
  • ftp

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