SBS 2008 security status showing not available



Hi all,

I am running SBS 2008 with uptodat patches. I have a problem with the SBS console that when I go to Computers tab under Network, the Security Status column shows Not available for all the servers and all of the client computers are shown as Critical. However, client computers are shown as OK sometimes.

I had a look at the console log and it shows:

[11728] 091026.162631.7511: Security Plugin Infrastructure: SecurityFeature : Aborting health check as it did not complete in timely manner
[11004] 091026.162631.7521: Security Plugin Infrastructure: BinaryHealthCheck : Plugin run into an error and did not handle it. if this problem repeats remove the plug-in
[11004] 091026.162631.7531: Security Plugin Infrastructure: BinaryHealthCheck : Faulty Plugin Assembly : BinaryHealthChecks.dll , Class Name : Microsoft.WindowsServerSolutions.SystemHealth.AVHealthCheck
[11644] 091026.162631.7541: Antimalware Reporting: Client : LPSERVER.leaseplus.local, Thread ID : 24 : AntimalwareReport : Client is not in antimalware framework client list : SERVER1.leaseplus.local
[11644] 091026.162631.7551: Antimalware Reporting: Client : SERVER1.leaseplus.local, Thread ID : 24 : AntimalwareReport : Client is not in antimalware framework client list : SERVER1.leaseplus.local
[11644] 091026.162631.7561: Antimalware Reporting: Client : SERVER2.leaseplus.local, Thread ID : 24 : AntimalwareReport : Client is not in antimalware framework client list : SERVER2.leaseplus.local
[11644] 091026.162631.7561: Antimalware Reporting: Client : LPSQL.leaseplus.local, Thread ID : 24 : AntimalwareReport : Client is not in antimalware framework client list : SERVER2.leaseplus.local
[11728] 091026.162631.7621: Security Plugin Infrastructure: SecurityFeature : Health check aborted as it failed complete in timely manner
[11004] 091026.162631.7841: Security Plugin Infrastructure: BinaryHealthCheck : Faulty plugin reported problem : System.Threading.ThreadAbortException: Thread was being aborted.
at System.Threading.WaitHandle.WaitOneNative(SafeWaitHandle waitHandle, UInt32 millisecondsTimeout, Boolean hasThreadAffinity, Boolean exitContext)
at System.Threading.WaitHandle.WaitOne(Int64 timeout, Boolean exitContext)
at Microsoft.WindowsServerSolutions.AntiVirus.Infrastructure.AntimalwareReport.WaitForAllClientQueriesComplete()
at Microsoft.WindowsServerSolutions.AntiVirus.Infrastructure.AntimalwareReport.GeneratePrivate()
at Microsoft.WindowsServerSolutions.AntiVirus.Infrastructure.AntimalwareReport.Generate()
at Microsoft.WindowsServerSolutions.SystemHealth.AVHealthCheck.Execute()
at Microsoft.WindowsServerSolutions.SystemHealth.Infrastructure.BinaryHealthCheck.Execute()

Any help will be appreciated.

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