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When our web-server is under DDoS with syn flood, all available sessions are used - if we set maximum cuncurrent conenctions to 99999, after a few secounds of DDoS, I can see in log:

connlimit="99999" dsthost="control" dstip

If we disable connection limit, I can feel that Kerio Control (4 Gb RAM) can handle about 300-400k (maybe 500, but I'm not sure) sessions and then CPU load will be to high or out of RAM, so I had to stop this.

But even after some time after that, I can see all of the connections at "Active connections" screen.

Is that possible to reduce the time of that connections? Now all I can do, is block all that IP's (subnets), but there are too many.

Thank you

[Updated on: Wed, 15 June 2016 01:22]

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