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Looks like some of your requests contain data that is considered malicious by DW. The IP address might be banned and then DW will deny any further requests from that IP.

Have a look at the file /Files/System/_BannedIps.txt - Does it contain any IP addresses?

You can try to change the security settings and see if it makes any difference.

I think Morten is right. DW sleeps the thread 4 seconds before giving a 403.1 response code to banned IPs

Hi Morten, 

Thanks for the reply. As you suggest i disable the security setting, after disable it, it doesn't genarate a _BannedIps.txt file. But still I have the same issue, cpu load grows to 100% and this didn't stop, see also screenshot. It looks like  Dynamicweb.Frontend.GlobalAsaxHandler.Application_OnPreRequestHandlerExecute(sender, e) is the issue. 

Do someone have any suggestions?

Thanks!

Did you drill into the 17 hidden child methods that generate the spike in CPU? That might shed some light.

Imar

unfortunately it's not possible to view this code. I tried to download the debug symbols of version 8.6.4.1, but these are not available. I will try to update to the latest 8.6 version....

I update to version from 8.6.1.4 to 8.6.1.10, so far i can see now this solve the issue. I read the releae notes and see change according this issue...