In my case, driver mspfltex.sys has been blocked from loading. This file is located in C:\WINDOWS\system32\drivers on ISA Server. Mspfltex.sys is a MSP Packet Filter Extension. When you install ISA 2000 on Windows Server 2003, it automatically blocks this driver from loading. To resolve this, install ISA SP# 2 along with "ISA Server 2000: Required Updates for Windows Server 2003". See ME555426 for more details.
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