FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
This article describes that backup logs in plaintext format avoid LZ4 decompression.
By default, if the logs are backed up to the FTP server, logs will be encrypted.
# execute backup disk alllogs ftp <IP_address> <username> <password>
# execute backup disk log ftp <IP_address> <username> <password> <log_type>
If it is necessary to upload the logs to Fortianalyzer, it is necessary to decrypt it using LZ4 and then upload it to the FortiAnalyzer.
Scope
FortiGate version 7.0.4+
Solution
After 7.0.4+ Firmware, in all Firewall models, it is possible to add an uncompressed parameter at the end of the command '# execute backup disk log ftp' to have a cleartext file and that will be easier to upload to the Fortianalyzer.
