1001 Secrets for Windows NT Registry
(Publisher: 29th Street Press)
Author(s): Tim Daniels
ISBN: 1882419685
Publication Date: 12/01/97

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I-302 Do you want to change the default string that users see when they are prompted to log on to your server? Try this registry entry.

Hive: HKEY_LOCAL_MACHINE
Key: Software\Microsoft\Windows NT\CurrentVersion\Winlogon
Value Name: LogonPrompt
Data Type: REG_SZ
Value: Enter a user name and password that is valid for this system.

The message shown is the default. Replace it with anything you like; you have up to 256 characters.

I-303 Do you want to change how far in advance your users are warned that their passwords will expire? This registry entry controls the number of days before expiration that Windows NT warns your users.

Hive: HKEY_LOCAL_MACHINE
Key: Software\Microsoft\Windows NT\CurrentVersion\Winlogon
Value Name: PasswordExpiryWarning
Data Type: REG_DWORD
Value: 14

I-304 Are your users experiencing slow response time when performing routine file activities? This parameter lets you allocate more resources by specifying the maximum number of active searches that can run concurrently on your server.

Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\LanmanServer\ Parameters
Value Name: MaxGlobalOpenSearch
Data Type: REG_DWORD
Value: 4096

Valid values are 1 to infinity. A higher value allows more searches on the server to be active at one time and also uses more resources. A lower value saves resources but can cause clients to experience poor performance.

I-305 Have you ever wanted to set the threshold that triggers the administrative alert for disk space? This registry entry lets you set the value from 0 to 99 percent of remaining free disk space.

Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\LanmanServer\ Parameters
Value Name: DiskSpaceThreshold
Data Type: REG_DWORD
Value: 10

Values can range from 0 - 99; the default is 10. Restart your system for these values to take effect.

Mailslots

Mailslot controls are part of tweaking your General Networking values.

I-306 Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\Netlogon\Parameters

Add the MaximumMailslotMessages value.

Value Name: MaximumMailslotMessages
Data Type: REG_DWORD
Value: 500

This value governs how much space Netlogon sets aside to buffer incoming Mailslot messages. Under normal circumstances, Mailslot messages are serviced as they arrive; however, if you have a particularly busy network, these messages can back up. Each Mailslot message takes up roughly 1500 bytes of nonpaged pool memory until it is removed from the buffer. Altering this value gives you additional control over how much nonpaged pool memory is used.

I-307 Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\Netlogon\Parameters

Add the MaximumMailslotTimeout value.

Value Name: MaximumMailslotTimeout
Data Type: REG_DWORD
Value: 10

This value determines how long, in seconds, a Mailslot message is valid. If Netlogon processes a message that is older than the value set in MaximumMailslotTimeout, it simply discards it. Ideally, Windows NT services incoming Mailslot requests in subsecond time; however, if your system is overloaded or the network congested, you may need to increase this value.

I-308 This number dictates how long NetLogon ignores duplicate Mailslot messages. Netlogon compares previous Mailslot messages with current Mailslot messages. If Netlogon receives the same message as one it has already received in the number of seconds specified by MailslotDuplicateTimeout, it discards the second message.

Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\Netlogon\Parameters

Add the MailslotDuplicateTimeout value.

Value Name: MailslotDuplicateTimeout
Data Type: REG_DWORD
Value: 2


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