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Solved: How do I rebuild FFDB database to fix error ‘ffdb_err_msg_print: ret=-4, Error: kernel error’

By: Author Alex Lim

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Home > Solved: How do I rebuild FFDB database to fix error ‘ffdb_err_msg_print: ret=-4, Error: kernel error’

This article describes how to rebuild the FFDB database in case of error ‘ffdb_err_msg_print: ret=-4, Error: kernel error’.

– Kernel error ‘ffdb_err_msg_print: ret=-4, Error: kernel error’ is observed on the FortiGate when there is an issue the FFDB files.

This can be verified using the below command:

# diagnose debug config-error-log read

– It is possible to remove the FFDB files using the below steps and download the database again.

To clear the ffdb files:

# diag internet-service clear /data2/ffdb_app
# diag internet-service clear /data2/ffdb_map

Run the below command to downlad the database again:

# execute update-now

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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