Customizing a Network Using the Registry phần 2

Client Settings To configure client settings for Remote Desktop, you need to open the Properties window for specific user accounts.. Figure 8.35: The Remote control tab of the user acc

1

Figure 8.33: The PortNumber value entry under

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TerminalServe r\WinStations\RDP-Tcp\PortNumber

2 Now, to access the server using the new setting, type the new port number after the IP address of the computer to which you want to connect If the new port is

8098, and the IP address of the server is 192.168.1.8, the new IP address and port combination will be 192.168.1.8:8098

Client Settings

To configure client settings for Remote Desktop, you need to open the Properties

window for specific user accounts To do so, proceed as follows:

1 Open Control Panel, select the Administrative tools option, and then start Users and Computers or Active Directory Users and Computers MMC snap-ins

(depending on the role of your computer and whether it participates in a domain)

2 Right-click the user account that will be used for administrative access, and select the Properties command from the context menu to open the properties window Go

to the Sessions tab (Fig 8.34) Notice that the settings on the Sessions tab are similar to those found in Terminal Services Configuration However, the

settings specified using the Terminal Services Configuration tool override those

set for the individual user

Figure 8.34: The Sessions tab of the user account properties window

3 The Remote control tab (Fig 8.35) settings establish whether or not this account

can be remotely controlled Administrative accounts and user accounts that are used by administrators for Remote Desktop should not be configured to allow remote control Therefore, in order to strengthen security, it is recommended that

the user clear the Enable remote control checkbox, as shown in this illustration

Figure 8.35: The Remote control tab of the user account properties window

Note In addition to settings that enhance security, strong policies and procedures will increase security as well More detailed information on this topic will be provided

in Chapter 9

Registry Entries for the W32Time Service

One of the most confusing elements in Windows 2000 and Windows Server 2003

domains is the W32Time service, which is integrated into the operating system in order

to ensure that date and time are properly synchronized throughout your organization

Unfortunately, installation instructions don't explain the reliance of user authentication on time, and, therefore, many organizations run into logon problems

The W32Time service settings are stored in the registry under the

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameter

s key (Fig 8.36)

Figure 8.36: The W32Time service settings in the system registry

The value entries that you can specify here to tune the W32Time service are outlined in Table 8.3

Table 8.3: W32Time Service Registry Values

AvoidTimeSyncOnWan REG_DWORD Synchronize with a

computer that is at a different site

0 = Site is ignored [default]

1 = Do not

synchronize with a time source that is at

a different site

GetDcBackofMaxTimes REG_DWORD The maximum number of

times to double the back off interval when

successive attempts to find a domain controller fail An event is logged every time a full wait occurs

0 = The wait between attempts is at a

minimum and no event is logged

7 = [default]

GetDcBackofMinutes REG_DWORD The starting number of

minutes to wait before looking for a domain controller, if the last attempt failed

15 =[default]

LocalNTP REG_DWORD Start the SNTP server 0 = Don't start the

SNTP server, unless this computer is a domain controller

Table 8.3: W32Time Service Registry Values

[default]

1 = Always start the SNTP server

NtpServer REG_SZ Stores the value from

NET TIME/SETSNTP

Blank by defaut Sample data value: 192.4.41.40

Period REG_DWORD Control how often the

time service synchronizes

0 = once a day

65535, every 2 days

65534, every 3 days

65533, every week (7 days)

65532, every 45 minutes until 3 good synchronizations occur, then once every 8 hours (3 per day) [default]

65531, every 45 minutes until 1 good synchronization occurs, then once every day

ReliableTimeSource REG_DWORD Does this computer have

a reliable time source?

0 = No [default]

1 = This computer has a reliable time source (this is only useful on a domain controller)

synchronize

Nt5DS = synchronize

to domain hierarchy

or manually configured source

Table 8.3: W32Time Service Registry Values

[default]

NTP = synchronize

to manually configured source

NoSync = do not

synchronize time

information between reboots

Change not recommended

msSkewPerDay REG_DWORD Maintains computer clock

information between reboots

Change not recommended

Note Period can be a type REG_SZ with special values: Bidaily, every 2 days; Tridaily, every 3 days; Weekly, every week (7 days); SpecialSkew, every 45 minutes until 3 good synchronizations occur, then once every 8 hours (3 per day) [default];

DailySpecialSkew, every 45 minutes until 1 good synchronization occurs, then once every day

Disabling Dynamic DNS Registration

By default, all computers running Windows 2000, Windows XP, or Windows Server

2003 attempt to dynamically register on the DNS servers specified on the General tab of the TCP/IP properties window To disable this feature, click the Advanced button on the General tab of the Internet Protocol (TCP/IP) Properties window The Advanced TCP/IP Settings window will open Go to the DNS tab and clear the Register this

connection's addresses in DNS checkbox

In case you want to perform the same operation using the registry, open the

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\In terfaces key, and set the DisableDynamicUpdate value (of REG_DWORD data type) to

1

Disabling Persistent Network Connections

To disable the option for restoring persistent network connections, start the registry editor, open the

HKEY_USERS\.DEFAULT\Software\Microsoft\WindowsNT\CurrentVersion\Network\

Persistent Connections key, and locate the SaveConnections setting The default value for this setting is yes (Fig 8.37) To disable persistent network connections, set this value to

no

Figure 8.37: The

HKEY_USERS\.DEFAULT\Software\Microsoft\WindowsNT\CurrentVersion\Network\ Persistent Connections registry key

Not

e

To disable persistent network connections for users, set the SaveConnections value

to no in all existing user profiles This information is stored in the registry under the following keys:

HKEY_\USERS\<User_SID>\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\ Network\Persistent Connections