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I have Centos 5.7 64bit; I have installed vsftpd as standalone service and using it for two years now with no problem. Suddenly; only it works with active mode. The passive mode stops working and gives time out. Firewall is disabled and SELinux is set to permissive. I ran tcpdump and I noticed that only first three packets reached the FTP for passive mode and no more packets on other ports #