Obtaining diagnostic logs when firewall is freezing

08/17/2022 1,394 People found this article helpful 484,095 Views

Description

Technical Support require console logs to be provided for analysis when the device isn't responding via GUI or through any LAN/WAN interfaces.
Unfortunately after rebooting the firewall, most of the required data will be lost and Tech Support will be unable to provide root cause analysis or resolution.

Console logs are important in the following cases:

If the firewall is freezing and GUI is inaccessible, console logs before the reboot will show us what process is causing the failure.
NOTE: If the SSH is also not working, the only option is to connect via a console cable
If the firewall randomly reboots, it's always recommended to have a console cable connected and actively logging so that we can catch the error causing the reboot.

When the firewall locks up or becomes unresponsive there is some data that can help our Tech Support find the probable root cause of the reported issue.

Resolution

This article will use Putty client to gather key information over SSH connection.

For information on how to connect via console cable: How to export SonicWall UTM console logs to a file

Log in to SonicWALL Firewall via Putty or another terminal emulator program.
To save the console output to a file browse to Session | logging.
Select option All session output under Session logging and locate a path for file to be saved as .txt.
Select the radio button Always append to the end of it and ensure Flush log file frequently box is unchecked.
Click on the session from the left hand side and type the IP address of the SonicWall under Host name and ensure SSH is selected under "Connection Type"
Click on the Open to connect to the appliance via SSH and wait for username prompt, enter username/password and wait for the command line prompt to appear.

NOTE: SSH must be enabled on the interface you're connecting to.

Resolution for SonicOS 7.X

This release includes significant user interface changes and many new features that are different from the SonicOS 6.5 and earlier firmware. The below resolution is for customers using SonicOS 7.X firmware.

To export Tech Support Report type the following:

no cli pager session
show tech-support

After running the above, please run the following commands:

diag show CPU
diag show processes
diag show process process_name
NOTE: replace process_name with the name of the process that is overloading the CPU( i.e. stacktrace zNSM) based on the output of diag show CPU
Please run this command for 8 to 10 times as it will give different outputs.
diag show multicore
diag show process DP-engine-0
diag show process DP-engine-1
diag show process DP-engine-2
diag show process DP-engine-3
show interfaces status
show interfaces statistics (Run the same command after 10-15 seconds again)
show switch-statdump (Run the same command after 10-15 seconds again)
show status
diag show mem-pools
diag show memory
diag show pktio-nic
diag show web-server
diag show timer-counters
diag show pktio-throughput-stop
diag show drop-stats
diag show pp-stats
diag show wd-stats
diag show ipnet sockets
diag show ipnet statistic
diag show ipnet TCP-statistic
diag gen-coredump (run this command last as executing the command will restart the firewall and generate new coredump. Download coredump after reboot)

To export the Tracelogs and console logs, they can only be obtained via API, FTP or SCP but they can't be generated via CLI.

export trace-log <WORD> { api | FTP <FTP_URL> | scp <SCP_URL> [ port <IPV4_PORT> ] }
EXAMPLE: export trace-log &traceLogType=1 scp user@server:/home/user/tracelog.wri
export console-logs { api | FTP <FTP_URL> | scp <SCP_URL> [ port <IPV4_PORT> ] }
EXAMPLE: export console-logs scp user@server:/home/user/consolelogs.wri

Attach the file which was saved for saving the console output to the support case for analysis.

Resolution for SonicOS 6.5

This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.

To export Tech Support Report type the following:

no cli pager session
show tech-support

After running the above, please run the following commands:

diag show tracelog current
diag show tracelog last
diag show CPU
diag show process process_name
NOTE: replace process_name with the name of the process that is overloading the CPU( i.e. stacktrace zNSM) based on the output of diag show CPU
Please run this command for 8 to 10 times as it will give different outputs.
diag show mem-pools
diag show cp-stats
diag show memory
diag show memzone
diag show wd-stats
diag show fpa
show log view

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Obtaining diagnostic logs when firewall is freezing

Description

Resolution

Resolution for SonicOS 7.X

Resolution for SonicOS 6.5

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