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My Oracle application is slow. "Packet dropped - TCP sequence out of order"
03/26/2020 
32 People found this article helpful
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Description
This article provides troubleshooting steps to resolve packets of Application Oracle being dropped on the SonicWall firewall due to drop code "Packet dropped - TCP sequence out of order".
Packet capture shows the following:
TCP Packet Header
TCP Flags = [ACK,PSH,], Src=[1521], Dst=[xxxxx], Checksum=0x2e9a
Application Header
Oracle
Value:[2]
DROPPED, Drop Code: xxx(Packet dropped - TCP sequence out of order)
TCP Flags = [ACK,PSH,], Src=[1521], Dst=[xxxxx], Checksum=0x2e9a
Application Header
Oracle
Value:[2]
DROPPED, Drop Code: xxx(Packet dropped - TCP sequence out of order)
Resolution
- Login to the SonicWall Management GUI.
- Navigate to Firewall Settings | Advanced | Dynamic Ports
- If "Enable support for Oracle (SQLNet)" is enabled, disable it:
4. Click Accept to save the configuration and test again.
If the issue persists, please contact SonicWall Support.
Resolution for SonicOS 6.5 and Later
- Login to the SonicWall Management GUI.
- Click Manage in the top navigation menu
- Navigate to Firewall Settings | Advanced Settings | Dynamic Ports
- If "Enable support for Oracle (SQLNet)" is enabled, disable it:
5. Click Accept to save the configuration and test again.
If the issue persists, please contact SonicWall Support.
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Categories
- Firewalls > TZ Series
- Firewalls > SonicWall NSA Series
- Firewalls > NSa Series
- Firewalls > SonicWall SuperMassive 9000 Series
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