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[ScreenOS] Debug shows "packet dropped, drop by firewall check"

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Article ID: KB13534 KB Last Updated: 16 Oct 2020Version: 4.0
Summary:

When a debug is run, it shows that the firewall is dropping packets with the message: "packet dropped, drop by firewall check." This article explains what must be done to troubleshoot the issue.

 

Symptoms:

In the ''debug flow basic' output, the following message is reported "packet dropped, drop by firewall check". Why would the firewall drop the packet?

 

Solution:

This message is indicating that one of the Screening options configured on the firewall is being triggered, and it is blocking this traffic. 

  • View the event log with the command get event to see what screen options are being triggered.

  • View the screen counters, with the command get zone <zone_name> screen counter, to see which ones are incrementing.

Based on the options being triggered, you may need to correct the problem or adjust the settings; for example, you may need to adjust a session limit.

 

Modification History:

2020-10-16: Article reviewed for accuracy; article found valid and relevant; no changes made

 

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