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WINDOWS MAXUSERPORT TUNING

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Abstract

ScriptServer® PAN Printing System (PAN) stability and performance on Microsoft Windows 2000 Server and Microsoft Windows 2003 Server is improved by adjusting MaxUserPort Registry entry.

Discussion

PAN consists of a number of components which actively communicate with each other. In order to do so, these components reserve and open IP ports. On the Microsoft Windows brand platforms only, collisions within the available pool of ports are experienced; this is not because PAN behaves differently, it is because of apparent differences in the way that Windows manages its pool of ports.

Collisions in the port pool can prevent the PAN components from communicating with each other efficiently. Adjusting the MaxUserPort registry entry (which does not exist by default) to a larger value reduces the likelihood of collisions by allowing Windows a greater range of port values to choose from when allocating ports.

Creating the Registry Entry

1. Create the following Registry entry as a DWORD value:

   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\MaxUserPort

   and set it to the value of 50000 (decimal).

2. Reboot the system.

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