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Description of problem:
vsftpd DNS lookup cannot be disabled.
This bug have been resolv in 5.x with the option 'reverse_lookup_enable'
but in 6.2 this option is no longer available
https://rhn.redhat.com/errata/RHBA-2009-1282.html :
...
* the DNS reverse lookup feature was implemented without any way to disable
it. This update contains the parameter 'reverse_lookup_enable', which
allows users to enable or disable the DNS reverse lookup functionality.
(BZ#498548)
...
Version-Release number of selected component (if applicable):
rpm -qi vsftpd
Name : vsftpd Relocations: (not relocatable)
Version : 2.2.2
Release : 6.el6_2.1
How reproducible:
ALWAYS
Steps to Reproduce:
1. having 2(or more) nameserver in /etc/resolv.conf that is NOT reachable
2. and then try to connect to the ftp server.
Actual results:
Connection timed out
Expected results:
Connection succesfull
Additional info:
trying with "reverse_lookup_enable=NO"
service vsftpd restart
Shutting down vsftpd: [FAILED]
Starting vsftpd for vsftpd: 500 OOPS: unrecognised variable in config file: reverse_lookup_enable
[FAILED]