The vsftpd behind NAT using 'pasv_address' option.

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Issue

When we use "pasv_address=external-server-IP" in the vsftpd.conf file then switching to PASV mode in the FTP client leads to immediate connection reset. This behaviour is not observed when we assign to pasv_address "pasv_address=internal-server-IP" or "pasv_address=internal-server-IP external-server-IP".

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprose Linux 6
vsftpd

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