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'TCP FIN Packet Dropped' in logs and i'm not sure why?

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  • 'TCP FIN Packet Dropped' in logs and i'm not sure why?

    I have a Sonicwall TZ 200 Wireless-N on our network that separates 2 subnets, 192.168.1.0/24 & 192.168.3.0/24. There are access rules for X0 & X1 that allow any/any through (basically fully open).

    The reason I'm posting is because we are having trouble with a client/server application hanging up. The server is 192.168.1.1 and the client is 192.168.3.64. I constantly get these messages logged in the Network log and I'm not sure why. I'm not even sure if this is what's causing the client application to hang, but it's the best guess I have right now.
    Code:
    Message: TCP FIN packet dropped
    Source: 192.168.1.1, 1, X1
    Destination: 192.168.3.64, 2980, X0
    Any help would be appreciated and I can post any more details requested.

  • #2
    Re: 'TCP FIN Packet Dropped' in logs and i'm not sure why?

    you may alreayd be aware - TCP FIN is the final stage of a TCP session teardown..
    so soemthing is trying to destroy an open TCP session - the firewall is dropping that packet (possibly because it thinks the session isn't in FIN-WAIT?)
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