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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]
The fix will be available in the next update 6.3. *** This bug has been marked as a duplicate of bug 752954 ***