That is, NDIS IM drivers that do more then simply passing or blocking packets. The symptoms are vague. Can browse the Internet, but not the Network Neighborhood. Excessive packets are lost when the NDIS IM driver is installed.
Checksums are incorrect in transmitted packets.
This is to avoid problems with incorrect sequence of operations on data. In at least some cases this behavior can be related to an NDIS IM driver design that does not adequately account for NDIS Task Offload that was introduced with NDIS 5.0. NDIS Task Offload is implemented on Windows 2000 and higher. IpSecNdisTask - IP Security offload. TcpLargeSendNdisTask - Segmentation offload.