Full SSL Inspection Suddenly Slowing Performance.

[hillsitsupp]

Hi

Yesterday I had to disable full SSL inspection in our proxy policies due to poor browsing performance.

Fortigate 200E running 7.0.15

No policy changes were made, and user numbers, session numbers and interface throughput are average for daily use. This is an edge firewall. I tested early this morning before most users were in, and still had slow performance.

I tried restarting the WAD processes, to no avail.

CPU and memory are both fine, with no change when DPI is disabled/enabled. I notice no change in CPU/SPU ratio when turning DPI on/off either.

Any ideas where I should look to diagnose this, and has anyone else experienced a similar problem?

[abarushka]

Hello,

You may consider to run in CLI "diagnose debug crashlog read" and check whether wad is crashing by searching for string "application wad" in the output of "diagnose debug crashlog read".

[hillsitsupp · Accepted solution]

Unfortunately nothing was revealed looking at the crash log.

I upgraded the firmware to the Fortinet recommended version, 7.2.7, and the problem has resolved itself.

Thanks for taking the time to reply, I appreciate it.

[FortiArt]

You need to check if using certificate inspection the performance is good or not. If good, this mean DPI is the problem. In such a case you can can exempt trusted Internet destination from ssl DPI. You can also try it using flow-inspection on the relevant firewall policy and check if performance improved. Hope this helps