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The way i solved this is turn off Memory Logging and Archiving under Log & Report > Log Config > Log Settings.
PCNSE
NSE
StrongSwan
Since I upgrade to 5.2/5.2.1 on my Fortigate 200B units, their CPUs are going to 100% every ~2 weeks and stay there. In that situation I cannot login via SSH, i.e. I can enter the user name and password. After pressing ENTER nothing happens, no CLI is shown). I can login to the webgui (From there I cannot login to the cli, same problem as mentioned before) But after hitting reboot within the gui, nothing happens anymore. I´m loosing IP connectivity at all. The only way to get them working again, is to plug the power cable off and on.
I have 4 units with that problem. I only have basic NAT masquerading and some firewalls enabled, no IPS, nothing else. With FortiOS 4.3 I didn´t have those problems at all.
Of course I opened tickets at Fortigate support and gave them debug logs and configs. So far I haven´t received any reason for what is causing those high cpu usage. Currently logging to the devices is completely shutdown in order to see whether logging is the problem.
I also have problem on 200B after 5.2.0 update. The problem is "FortiGate has reached system connection limit for 1 seconds" messages but after looking logs for sessions it isn't even close to top of connection limit. With same configuration on 5.0.9 there was no problems at all.
I had the same problem in 5.2.0 but in 5.2.1 fortigate works better.
The way i solved this is turn off Memory Logging and Archiving under Log & Report > Log Config > Log Settings.
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