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Packet Dropped - TCP Sequence Out Of Order

Have to migrate an Oracle Database 12 to other DB on a remote site (LAN -> VPN)

I got this erros on packet monitor all the time and my connection is cut of after a few minutes.

I disabled "Enable support for Oracle (SQLNet)" and disabled "TCP Randomization" in diag.html.

Any ideas?

Category: Mid Range Firewalls


  • BWCBWC Cybersecurity Overlord ✭✭✭

    Hi @brunogabriel

    are both sides (local and remote) secured by SonicWall Appliances?

    I don't have any Oracle experience, but did you tried to "Disable DPI" on the Advanced tab of the Firewall rule allowing the traffic? Usually having this on both sides would make sure that DPI is not messing this up.

    VPN connection is stable I suppose?

    Best regards.


  • Yep, I disabled DPI on rules LAN -> VPN, VPN -> LAN

    It's supposed to be stable, tried with more then one WAN.

  • Hi @brunogabriel ,

    Can you confirm if the option " fix/ignore TCP malformed packets" on diag page is enabled or disabled ?

    Is there any disconnectivity issue that you experience, if there is then do you experience it after certain specific time or does it occur randomly ?


    Nevyaditha P

    Nevyaditha P

    Technical Support Advisor, Premier Services

  • ClemensClemens Newbie ✭


    I have a similar problem with some Oracle clients. On Sonicwall packets are dropped with the following message:

    "DROPPED, Drop Code: 70(Invalid TCP Flag(#1)), Module Id: 25(network), (Ref.Id: _5712_uyHtJcpfngKrRmv) 2:2)"

    I applied the workaround "Dropped packets because of "Invalid TCP Flag", the option "Enable support for Oracle (SQLNet)" is disabled (was enabled before).

    Currently we are using Oracle version 19.

    Curiously, the connection works on one client (no packets are dropped), but on two others this problem occurs.

    Is there a tip to solve the problem?

    kind regards Clemens

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