Specifications

Caution

The Enhanced Write Filter cache should never be flushed if it is

eighty-percent or more full. The administrator should periodically check the

status of the cache and restart the thin client if the cache is more than eighty

percent full.

Note

A Terminal Services Client Access License (TSCAL) is always preserved

regardless of Enhanced Write Filter state (enabled or disabled).

If you want to have other registry settings preserved regardless of Enhanced

Write Filter state, contact support for help at http://www.wyse.com

For procedures on using the Enhanced Write Filter, refer to:

• “Password Change with the Enhanced Write Filter”

• “Enhanced Write Filter Command Line Control” on page 46

• “Enhanced Write Filter Enable and Enhanced Write Filter Disable Desktop Icons” on

page 47

• “Enhanced Write Filter Control Dialog Box” on page 48

Password Change with the Enhanced Write Filter

On Microsoft Windows NT-based computers and on Microsoft Windows 2000 or

2003-based computers, machine account passwords are regularly changed with the

domain controller for security purposes. By default, on Windows NT-based computers, the

machine account password automatically changes every seven days. On Windows 2000

or 2003-based computers, the machine account password automatically changes every

30 days. The same is applicable for Winterm

9 series Thin Clients if they are a member

of a domain.

With the Enhanced Write Filter enabled, a thin client will successfully make this change

with the domain controller. Because the Enhanced Write Filter is enabled, however, the

next time the thin client is booted it will not retain the new password. In such cases, you

can use the following options:

• Disable the machine account password change on a Winterm

9 series Thin Client by

setting the DisablePasswordChange registry entry to a value of 1.

• Disable the machine account password change in Windows NT 4.0 or in Windows

2000 or 2003, by setting the RefusePasswordChange registry entry to a value of 1

on all domain controllers in the domain instead of on all workstations. Winterm

series Thin Clients will still attempt to change their passwords every 30 days, but the

change will be rejected by the server.

Note

On Windows NT 4.0 domain controllers, you must change the

RefusePasswordChange registry entry to a value of 1 on all Backup

Domain Controllers (BDCs) in the domain before you make the change on

the Primary Domain Controller (PDC). Failure to follow this order will cause

event ID 5722 to be logged in the event log of the PDC.

If you set the RefusePasswordChange registry entry in the Windows 2000

or 2003 Domain Controller to a value of 1, the replication traffic will stop, but