MaxMpxCt 2506 Error in Event Log


Windows 2000 system event log shows errors after startup:

Event : 2506
Source : Server
The value named
MaxMpxCt in the server’s Registry key LanmanServer \ Parameters was invalid. The
value was ignored, and processing continued.

This is caused by the MaxMpxCt value having been set to less than 50
which is the legal minimum value. Unfortunately Norton’s AntiVirus and perhaps
other packages reset this value below the legal minimum. You can ignore the
message but this is not recommended. There are reports that sporadic network
errors were eliminated after MaxMpxCt was returned to its default. To fix, apply
the following Windows 2000 registry hack:

Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters
Name:
MaxMpxCt
Type: REG_DWORD
Value: 50

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