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My Oracle application is slow. "Packet dropped - TCP sequence out of order"
03/26/2020 
36 People found this article helpful
193,423 Views
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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