Sonicwall SSO causing DC CPU to spike

I have a sonicwall TZ300, that seems to be causing our AD server to peak above 90% when someone log's in on the SSL single sign on VPN.
The reason we believe it's the VPN SSO, is that the we can see on the server, CIAservice.exe hit 49% cpu usage. This service is the SSO agent that links to our AD.

Any idea how we can stop this from peaking so much ?

DC is windows 2012
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total123Asked:
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JohnBusiness Consultant (Owner)Commented:
If just one user, that would be strange. Maybe the user involved has excessive traffic on their computer adding this to the sonic wall.

I have see this (High CPU% on a Juniper machine) when an insecure wireless router (set up be a vendor, not us) let too much traffic in. The vendor has since secured and problems disappeared.
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total123Author Commented:
would traffic really affect the DC cpu thou, I figured it would be the sign on only.
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JohnBusiness Consultant (Owner)Commented:
One person, one sign-on, should not cause a CPU problem. At least I have not seen that. Look, I think, for other traffic.
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Wayne88Commented:
It may be the SSO agent:  https://community.spiceworks.com/topic/485366-sonicwall-sso-agent-causing-dc-cpu-spikes

Update the Sonicwall to the latest firmware and also install the latest SSO agent on the server.  If the CPU spike still happens call Sonicwall support.
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total123Author Commented:
thanks wayne88, I'll jump on that now.

great link
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Wayne88Commented:
You're welcome.  Let us know how it goes.
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