Sonicwall TZ-180 FTP issue - FTP: Port Bounce Attack Dropped

Posted on 2010-01-04
Last Modified: 2013-12-02
I have a sonicwall TZ-180. I have an application that is trying to establish a passive FTP connection, but Intrusion Protection on the sonicwall is dropping the connection with a log event that looks like this:

FTP: Port Bounce Attack Dropped

I have found some posts for older sonicwall devices that tells you how to go in and tell the sonicwall how to ignore this alert, but I cannot find anything on the sonicwall enhanced OS which is on my TZ-180. I have looked in the intrusion prevention section of my sonicwall but cannot find this particular event so I can disable it. Any help would be greatly appreciated!

Question by:jkwasson
    LVL 3

    Expert Comment

    In your IP configuration are you blocking low priority attacks? What other security services do you use?
    LVL 5

    Accepted Solution

    thanks for your help, but I figured this one out. My program is  a VB6 program and I was attempting to use the INET control which does not expressly allow for a PASV FTP connection. I switched the app to use API calls from wininet.dll, which allows you to explicitly set PASV FTP mode and as soon as I did that I had no issues getting through the firewall. I believe the INET control issues a PORT command, which got blocked by the firewall, wininet.dll does not do that in PASV mode

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