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Event ID: 1 Source: MicrosoftFirewallClient2004

Application [svchost.exe]. Authentication failed. The user credentials were not accepted by ISA Server. Verify that the user account running this application has the required permissions.
As per Microsoft: "This problem occurs because the ISA Server RPC filter is not compatible with the changes in the RPC protocol that are introduced by Windows Server 2003 SP1". See ME887222 for additional information.
In our environment (ISA 2004), this issue was corrected with assistance from Microsoft. Open the ISA console, expand "Configuration" and click "General". Click "Define firewall client settings", click the "Application settings" tab, scroll down to "svchost" and make sure both "DisableEx" and "Disable" are set to "1". We were having this problem when "DisableEx" was set to 0. Changing it to 1 corrected the issue.

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