Sun Java System Identity Synchronization for Windows 6.0 Deployment Planning Guide

Appendix C Logging and Debugging

This appendix expands on the logging and troubleshooting information available in the Sun Java System Directory Server Enterprise Edition 6.3 Troubleshooting Guide by describing how to use audit and debug logging to isolate problems in the system.

This appendix includes:

Audit Logging and Action IDs

Before enabling debug logging, make sure that setting the audit log level to FINEST does not produce the desired level of information. When a new log level setting is saved in the console, it is immediately propagated to every component, and messages at that log level and above will be logged to the central log.


Note –

Changes to the log level are not propagated to subcomponents, that is, the Directory Server Plugin, the Windows NT Change Detector, and the Windows NT Password Filter DLL, until the next configuration change is saved. To propagate a new log level setting to the subcomponents, make any minor edit to the configuration, undo the edit, and then save the configuration.


Actions

When an Identity Synchronization for Windows Connector detects a change to a user entry, it uses an action to represent this change as it travels through Identity Synchronization for Windows. Each action includes a type such as CREATE, MODIFY, or DELETE, and enough attributes from the user entry to allow the destination connector to synchronize the change. The type of an action appears in log entries can be one of the following:

Connector Layers - Accessor, Controller, and Agent

During processing, an action is passed through three different layers of the connector: accessor, controller, and agent. Each layer has different responsibilities:

For higher performance, the connector processes many actions at once, so log messages for different actions are interleaved. When the processing of an action is complete, the source of the action (that is, the Accessor or Message Queue) is notified by an acknowledgement. After an action is acknowledged, the source of the action is no longer responsible for re-delivering the action in the event of a failure. The action path that detected changes from the directory source to Message Queue is known as the inbound path. The action path that applies changes from Message Queue to the directory source is known as the outbound path. These action paths are summarized in the following figure.

Figure C–1 Action Paths

Action Paths

To illustrate how this applies to log messages, a sample message from the central audit.log, when user John Test's password was changed, is given below:

[01/Nov/2004:07:17:56.082 -0600] FINE  54  CNN101 connectors-us  
"The controller has received the following inbound action from the accessor: 
Type: UNKNOWN {Data Attrs: } 
{Other Attrs: cn: John Test dn: CN=John Test,CN=Users,DC=gt,DC=com 
objectclass: top, person, organizationalPerson, 
user objectguid: coFNlF3ePUWC5Vm32GENfg== pwdlastset: 127437958757034806 
samaccountname: jtest sn: Test usnchanged: 313464 whenchanged: 20041101151755.0Z}." 
(Action ID=CNN101-FFEF4A8986-206, SN=1)

         

This message was logged as the Accessor passed a detected change along the inbound path to the Controller. The type of the action is UNKNOWN because the Controller has not yet compared the action with its object cache database. There are no data attributes in the entry because password values cannot be extracted from Active Directory. Instead, the pwdlastset attribute is used to detect if the password has changed. The action also includes a unique ID that can be used to track it through the system. A monotonically increasing sequence number (the SN value) also appears in the log entry. In rare circumstances where messages logged at different connectors arrive out-of-order at the Central Logger, the sequence number can be used to correctly order the messages. However, sequence numbers might not always increase by one. This action can be tracked through the log by searching for the unique ID ID=CNN101-FFEF4A8986-206:


bash-2.05# grep 'ID=CNN101-FFEF4A8986-206' audit.log
[01/Nov/2004:07:17:56.082 -0600] FINE    54  
CNN101 connectors-us  "The controller has received the following inbound action
from the accessor: Type: UNKNOWN {Data Attrs: } 
{Other Attrs: cn: John Test dn: CN=John Test,CN=Users,DC=gt,DC=com 
objectclass: top, person, organizationalPerson, 
user objectguid: coFNlF3ePUWC5Vm32GENfg== pwdlastset: 127437958757034806 
samaccountname: jtest sn: Test usnchanged: 313464 whenchanged: 20041101151755.0Z}." 
(Action ID=CNN101-FFEF4A8986-206, SN=1)
[01/Nov/2004:07:17:56.307 -0600] FINE    51  


CNN101 connectors-us  
"The agent has received the following inbound action from the controller: 
Type: MODIFY SUL: GT_USERS {Data Attrs: } 
{Other Attrs: cn: John Test dn: CN=John Test,CN=Users,DC=gt,DC=com 
objectclass: top, person, organizationalPerson, 
user objectguid: coFNlF3ePUWC5Vm32GENfg== pwdlastset: 127437958757034806 
samaccountname: jtest sn: Test usnchanged: 313464 
whenchanged: 20041101151755.0Z passwordchanged: TRUE}." 
(Action ID=CNN101-FFEF4A8986-206, SN=4)


[01/Nov/2004:07:17:56.320 -0600] INFO    51  
CNN101 connectors-us  
"The agent is sending the following inbound action to MQ: 
Type: MODIFY SUL: GT_USERS {Data Attrs: } 
{Other Attrs: cn: John Test dn: CN=John Test,CN=Users,DC=gt,DC=com 
objectclass: top, person, organizationalPerson, 
user dspswuserlink: coFNlF3ePUWC5Vm32GENfg== pwdlastset: 127437958757034806 
samaccountname: jtest sn: Test usnchanged: 313464 
whenchanged: 20041101151755.0Z passwordchanged: TRUE}." 
(Action ID=CNN101-FFEF4A8986-206, SN=6)

         
[01/Nov/2004:07:17:56.448 -0600] FINE    16  
CNN100 connectors-us  "The agent has received an outbound action from MQ: 
Type: MODIFY SUL: GT_USERS {Data Attrs: } 
{Other Attrs: cn: John Test dn: CN=John Test,CN=Users,DC=gt,DC=com 
objectclass: top, person, organizationalPerson, 
user dspswuserlink: coFNlF3ePUWC5Vm32GENfg== pwdlastset: 127437958757034806 
samaccountname: jtest sn: Test usnchanged: 313464 
whenchanged: 20041101151755.0Z passwordchanged: TRUE}." 
(Action ID=CNN101-FFEF4A8986-206, SN=7)


[01/Nov/2004:07:17:56.462 -0600] FINE    16  
CNN100 connectors-us  
"The controller has received the following outbound action from the agent:
Type: MODIFY SUL: GT_USERS {Data Attrs: } 
{Other Attrs: cn: John Test dn: CN=John Test,CN=Users,DC=gt,DC=com 
objectclass: top, person, organizationalPerson,
user dspswuserlink: coFNlF3ePUWC5Vm32GENfg== pwdlastset: 127437958757034806 
samaccountname: jtest sn: Test usnchanged: 313464 
whenchanged: 20041101151755.0Z passwordchanged: TRUE}." 
(Action ID=CNN101-FFEF4A8986-206, SN=8)


[01/Nov/2004:07:17:56.549 -0600] FINE    40  
CNN100 connectors-us  
"Applying outbound action to Accessor" 
(Action ID=CNN101-FFEF4A8986-206, SN=9)


[01/Nov/2004:07:17:56.557 -0600] FINE    40  
CNN100 connectors-us  
"The accessor has received the following outbound action from the controller: 
Type: MODIFY SUL: GT_USERS {Data Attrs: } {Other Attrs: cn: John Test 
objectclass: top, person, organizationalPerson, 
user dspswuserlink: coFNlF3ePUWC5Vm32GENfg== pwdlastset: 127437958757034806 
samaccountname: jtest sn: Test usnchanged: 313464 
whenchanged: 20041101151755.0Z passwordchanged: TRUE 
dn: uid=jtest,ou=People, dc=gt,dc=com}." (Action ID=CNN101-FFEF4A8986-206, SN=10)


[01/Nov/2004:07:17:56.640 -0600] FINE    40  
CNN100 connectors-us  
"Successfully modified user 'uid=jtest,ou=People, dc=gt,dc=com', 
action=Type: MODIFY SUL: GT_USERS {Data Attrs: [REPL dspswvalidate: true]}." 
(Action ID=CNN101-FFEF4A8986-206, SN=11)


[01/Nov/2004:07:17:56.657 -0600] INFO    40  
CNN100 connectors-us  
"Successfully modified user uid=jtest,ou=People, dc=gt,dc=com" 
(Action ID=CNN101-FFEF4A8986-206, SN=12)

Most log entries dealing with an action will include the Action ID, but some log entries will not. In these cases, the log entry without the Action ID is usually close to log messages that do include the ID. For example, a summary of the LDAP modification for the above password update appears between two other log messages:


[01/Nov/2004:07:17:56.557 -0600] FINE    40  
CNN100 connectors-us  
"The accessor has received the following outbound action from the controller: 
Type: MODIFY SUL: GT_USERS {Data Attrs: } 
{Other Attrs: cn: John Test objectclass: top, person, organizationalPerson, 
user dspswuserlink: coFNlF3ePUWC5Vm32GENfg== pwdlastset: 127437958757034806 
samaccountname: jtest sn: Test usnchanged: 313464 
whenchanged: 20041101151755.0Z passwordchanged: 
TRUE dn: uid=jtest,ou=People, dc=gt,dc=com}." 
(Action ID=CNN101-FFEF4A8986-206, SN=10)


[01/Nov/2004:07:17:56.567 -0600] FINE    40  
CNN100 connectors-us  "LDAP Modify Request: 
[REPLACE dspswvalidate: true] [REPLACE dspswloop: true] [REPLACE dspswloop: ] "


[01/Nov/2004:07:17:56.640 -0600] FINE    40  
CNN100 connectors-us  
"Successfully modified user 'uid=jtest,ou=People, dc=gt,dc=com', action=Type: 
MODIFY SUL: GT_USERS {Data Attrs: [REPL dspswvalidate: true]}." 
(Action ID=CNN101-FFEF4A8986-206, SN=11)

         

Note –

All messages that appear in the error log file also appear in the audit log file, to facilitate correlation of events leading up to the error or warning message.

The central log files are an aggregation of the individual component logs. As long as a connector can access Message Queue, all messages written to the local logs will also be written to the central log.

A special central log file is used for idsync resync operations. The information in this log is only available on the Core machine in the logs/central/resync.log file. During a resynchronization operation, some information is also logged to the audit log, so the Action ID may be required to correlate log entries between the two files.


Directory Server Plugin

Increasing the global log level alone might not display all the log entries from the Directory Server Plugin. Editing Directory Server's cn=config entry may also be required. To enable more informational logging, set the following attributes on Directory Server's cn=config entry.


Note –

nsslapd-infolog-area is a bit mask entry. If it already has a value, then bit-wise OR in the 16th least significant bit into the value.


To enable additional logging, set the attributes on Directory Server's cn=config entry as follows:

Debug Logging

Most of the Identity Synchronization for Windows components have debug logging capability. This section describes how to enable debug logging for each component.

Using debug logging to isolate a problem can be a time-consuming process. Be sure to read Chapter 7, Troubleshooting Identity Synchronization for Windows, in Sun Java System Directory Server Enterprise Edition 6.1 Troubleshooting Guide before using this method.

In Java Components

To enable debug logging in one of the Java components (connector, System Manager, or Central Logger), edit the process's command line in the WatchList.properties file to include the -Dcom.sun.directory.wps.flags.Flags.DBG=true flag, and restart the Identity Synchronization for Windows daemon (on Solaris) or service (on Windows). For example, debug logging for the CNN101 Connector has been enabled in the following example. The existing entry for the CNN101 Connector in the /var/opt/SUNWisw/resources/WatchList.properties file is shown below.


process.name[2]=CNN101
process.command[2]=/usr/java/bin/java  -Xmx256m  -Xrs  -DimqConnectionType=TLS  
-Djava.library.path=/opt/SUNWisw/lib:/usr/lib/mps/secv1  
-Djava.util.logging.config.file=/var/opt/SUNWisw/resources/Log.properties  
-Dcom.sun.directory.wps.logging.directory=/var/opt/SUNWisw/logs/CNN101  
-DPSWHOME=/var/opt/SUNWisw  -DWPSCNFG=resources   
-classpath /opt/SUNWisw/lib/common.jar:/opt/SUNWisw/lib/connector.jar:

/opt/SUNWisw/lib/db.jar:/opt/SUNWisw/lib/ldapjdk.jar:
/opt/SUNWisw/lib/manager.jar:
/opt/SUNWisw/lib/registry.jar:
/opt/SUNWisw/lib/watchdog.jar:
/var/opt/SUNWisw/resources:/opt/SUNWisw/locale/resources:
/usr/share/lib/jms.jar:/usr/share/lib/imq.jar:
/usr/share/lib/mps/secv1/jss3.jar:
/usr/sfw/share/lib/xerces-200.jar:. com.sun.directory.wps.controller.
AgentHarness CNN101

process.delay[2]=120000
process.interval[2]=60000

         

Note –

The idsync printstat command provides information about the Connector ID and the installation location, which can be used to find the correct entry in the WatchList.properties list.


In the following example, the command line entry for this connector has been edited to include the special debug option. It is safest to include this option as the first JVM option.


process.name[2]=CNN101
process.command[2]=/usr/java/bin/java  
-Dcom.sun.directory.wps.flags.Flags.DBG=true  
-Xmx256m  -Xrs   -DimqConnectionType=TLS  
-Djava.library.path=/opt/SUNWisw/lib:/usr/lib/mps/secv1  
-Djava.util.logging.config.file=/var/opt/SUNWisw/resources/Log.properties 
-Dcom.sun.directory.wps.logging.directory=/var/opt/SUNWisw/logs/CNN101  
-DPSWHOME=/var/opt/SUNWisw  -DWPSCNFG=resources   
-classpath /opt/SUNWisw/lib/common.jar:/opt/SUNWisw/lib/connector.jar:
/opt/SUNWisw/lib/db.jar:/opt/SUNWisw/lib/ldapjdk.jar:
/opt/SUNWisw/lib/manager.jar:/opt/SUNWisw/lib/registry.jar:
/opt/SUNWisw/lib/watchdog.jar:/var/opt/SUNWisw/resources:
/opt/SUNWisw/locale/resources:/usr/share/lib/jms.jar:
/usr/share/lib/imq.jar:/usr/share/lib/mps/secv1/jss3.jar:
/usr/sfw/share/lib/xerces-200.jar:. 
com.sun.directory.wps.controller.AgentHarness CNN101
process.delay[2]=120000
process.interval[2]=60000

         

After enabling this option, stop and start the Identity Synchronization for Windows daemon (on Solaris) or service (on Windows) so that the changes take effect.

To prevent conflicts with Message Queue, wait thirty seconds after stopping the Identity Synchronization for Windows daemon or service before restarting it. Once the process starts, it will write three new logs, logs/CNN101/debug.log, logs/CNN101/debugErrors.log, andogs/CNN101/resyncDebug.log.

Table C–1 Component-Level Debug Log Levels

Component

Type of Logging

Log.properties Level

accessor.level

Interaction with directory sources for detecting and applying changes. This is useful when problems accessing a directory source need to be diagnosed. 

FINER 

accessor.saint.level

Communication between the connector and the subcomponents. 

FINE (if not specified, inherits from accessor.level) 

controller.level

Processing that occurs within the Controller including determining membership in a SUL and interaction with the object cache. 

FINER 

agent.level

Processing that occurs within the agent including mapping attributes, sending messages over Message Queue, and receiving messages from Message Queue. 

FINER 

agentout.level

Processing that occurs within the agent on actions that are received from Message Queue. 

<default\> 

encryption.level

Encryption and decryption routines.

INFO 

mq.level

Interaction with Message Queue. 

<default\> 

manager.level

Processing done by the System Manager.

INFO (increasing to FINE+ can significantly slow performance during resynchronization operations) 

centralLogger

Processing done by the Central Logger.

<default\> (This can only be set in the CentralLoggerLog.properties) 

crom.level

Processing done by the configuration system that retrieves, manages, validates, and saves configuration in the configuration directory. 

INFO 

common.level

Processing done by common utility components. 

INFO 

tasks.level

Low-level execution information for each thread in the system. 

INFO (increasing to FINE+ can significantly slow performance) 

xml.level

Low-level parsing details for XML configuration objects. 

INFO (increasing to FINE+ can significantly slow performance) 

These log levels can be changed by editing the Log.properties files. The changes will be reflected after a restart.


Note –

All messages that appear in the audit log file also appear in the debug log file to facilitate correlation of events between the logs.


In the Installer

The installer and uninstaller can be configured to write extra debugging information to the installer log file, for example, Identity_Synchronization_for_Windows_install-20041025035143.log, by setting the ISW_DEBUG_INSTALL environment variable to true before starting the installer.


Note –

Secure information such as passwords might appear in the installer log file when debug logging is enabled.


In the Console

The console logs some information to the central log, but most information is only logged if the console is started with the -D option to enable debug logging. The -D option accepts a single argument which controls the amount of logging to generate. It varies from 1 (least) to 9 (most). By default, the logging information is only written to stderr, but it can also be redirected to a file using the -f option, for example:

bash-2.05# ./startconsole -D 7 -f /tmp/console.log

Windows NT Change Detection

When you start Windows NT Connector for the first time, with no existing object cache present, the corresponding Java process’s memory usage is approximately 26 to 30 MB. However, the Windows NT Connector's memory usage can easily reach 100 MB during normal operations.

The Windows NT Connector periodically polls the Windows NT subcomponents, that is, Identity Synchronization for Windows NT Change Detector Service and the Identity Synchronization for Windows Password Filter DLL for changes. After the connector retrieves changes from a subcomponent, the connector processes the change and based on the configuration, it will or will not send the change over Message Queue. After the connector finishes processing the change, it removes the change from the subcomponents.

If the Windows NT Connector is unavailable for a longer period of time, then the subcomponents can accumulate a significant number of changes in memory. A typical change record requires less than 100 bytes of memory, so 10 MB of memory can accommodate 100,000 changes. However, this scenario is not likely to occur on Windows NT.

Both the Change Detector service and the Password Filter DLL service maintain some internal counters. You can use these counters (with the connector's log file) to determine how far behind the connector is with change processing compared to the subcomponents.

For example, the following is a user creation entry in the connector's log:


[01/Nov/2004:10:29:07.390 -0600] 
INFO    18  CNN102 example-wnt  
"The agent is sending the following inbound action to MQ: 
Type: CREATE SUL: NT {Data Attrs: [ADD userpassword: ****]} 
{Other Attrs: sn: test cn: Jane Test user_rid: 1004 
dspswuserlink: RID=1004+DOMAIN=EXAMPLE subcomp_src: 
PASSWORD_FILTER usnchanged: 5}." 
(Action ID=CNN102-FFF4EFF25B-995, SN=0)

      

The important fields in this entry are:

"PfLastAckedChangeNumber"=hex:05,00,00,00,00,00,00,00
"PfLastAckedChangeTime"=hex:54,64,86,41
"PfHighestChangeNumber"=hex:05,00,00,00,00,00,00,00
"PfHighestChangeTime"=hex:52,64,86,41

      

Where:

[01/Nov/2004:10:30:31.802 -0600] 
INFO    18  CNN102 example-wnt  
"The agent is sending the following inbound action to MQ: 
Type: MODIFY SUL: NT {Data Attrs: } 
{Other Attrs: sn: test  cn: Jane Test user_rid: 1004 
dspswuserlink: RID=1004+DOMAIN=EXAMPLE subcomp_src: 
NT_CHANGE_DETECTOR usnchanged: 19}." 
(Action ID=CNN102-FFF4EFF25B-1162, SN=0)

In this example, the subcomp_src is set to NT_CHANGE_DETECTOR and the following counters are displayed in the same registry entry mentioned previously:

"LastProcessedSecLogRecordNumber"=dword:0000001b
"LastProcessedSecLogTimeStamp"=dword:418664a7
"HighestChangeNumber"=dword:00000013

      

In this example, the Change Detector does not show the last acknowledged changenumber, but the value of HighestChangeNumber is the same as the value in the log entry.

To determine (approximately) how many unprocessed changes there are in the Change Detector, check the last log entry in which the subcomp_src is set to NT_CHANGE_DETECTOR, and then compare the usnchanged value in the log entry with the HighestChangeNumber in the registry.

The LastProcessedSecLog counter refers to the last-processed entry in the system's security log.

The psloglist.exe in the PsTools software bundle from http://www.sysinternals.com/ facilitates listing the contents of the security log and printing out the security log numbers. For example,


C:\>psloglist.exe security
Security log on \\\\ EXAMPLE-WNT:
[027] Security
   Type: AUDIT SUCCESS
   Computer: EXAMPLE-WNT
   Time: 11/1/04 10:30:31 AM   ID: 642
   User: Administrator\\EXAMPLE
User Account Changed:
      Target Account Name: test
      Target Domain: EXAMPLE
      Target Account ID:
S-1-5-21-975783841-454902410-2021868755-1004
      Caller User Name: Administrator
      Caller Domain: EXAMPLE
      Caller Logon ID: (0x0,0x144B)
      Privileges:
...

      

In this example, the log record number is 27 (which corresponds to the value in LastProcessedSecLogRecordNumber - 0x1b).

Changing Central Logs File Location

The location of the central logs can be changed using the console or the Log Configuration tab. Specify the location in the Write log file to directory field.

Figure C–2 Log Configuration Tab

Log
Configuration Tab

Changing Component Logs File Location

The location of logs for Java components, that is, System Manager, Central Logger, and Connectors is changed by modifying the com.sun.directory.wps.logging.directory property in the WatchList.properties file.

In the following example, the logging directory for the Active Directory Connector is changed from /var/opt/SUNWisw/logs/CNN101 to /export/isw/logs/adConnector:


Original WatchList.properties entry:
process.name[2]=CNN101
process.command[2]=/usr/java/bin/java  
-Xmx256m  -Xrs  -DimqConnectionType=TLS  
-Djava.library.path=/opt/SUNWisw/lib:/usr/lib/mps/secv1
-Djava.util.logging.config.file=/var/opt/SUNWisw
/resources/Log.properties 
-Dcom.sun.directory.wps.logging.directory=/var/opt/SUNWisw/logs/CNN101  
-DPSWHOME=/var/opt/SUNWisw  -DWPSCNFG=resources   
-classpath /opt/SUNWisw/lib/common.jar:/opt/SUNWisw/lib/connector.jar:
/opt/SUNWisw/lib/db.jar:/opt/SUNWisw/lib/ldapjdk.jar:
/opt/SUNWisw/lib/manager.jar:/opt/SUNWisw/lib/registry.jar:
/opt/SUNWisw/lib/watchdog.jar:/var/opt/SUNWisw/resources:
/opt/SUNWisw/locale/resources:/usr/share/lib/jms.jar:
/usr/share/lib/imq.jar:/usr/share/lib/mps/secv1/jss3.jar:
/usr/sfw/share/lib/xerces-200.jar:. 
com.sun.directory.wps.controller.AgentHarness CNN101
process.delay[2]=120000
process.interval[2]=60000

      

Note –

The idsync printstat command provides information about the Connector ID and the installation location that can be used to locate the correct entry in the WatchList.properties file.


To change the logging directory, the command line entry for this connector must be edited as follows:


process.name[2]=CNN101
process.command[2]=/usr/java/bin/java  -Xmx256m  -Xrs  
-DimqConnectionType=TLS
-Djava.library.path=/opt/SUNWisw/lib:/usr/lib/mps/secv1  
-Djava.util.logging.config.file=/var/opt/SUNWisw/resources/Log.properties  
-Dcom.sun.directory.wps.logging.directory=/export/isw/logs/adConnector  
-DPSWHOME=/var/opt/SUNWisw  -DWPSCNFG=resources   
-classpath /opt/SUNWisw/lib/common.jar:/opt/SUNWisw/lib/connector.jar:
/opt/SUNWisw/lib/db.jar:/opt/SUNWisw/lib/ldapjdk.jar:
/opt/SUNWisw/lib/manager.jar:/opt/SUNWisw/lib/registry.jar:
/opt/SUNWisw/lib/watchdog.jar:/var/opt/SUNWisw/resources:
/opt/SUNWisw/locale/resources:/usr/share/lib/jms.jar:
/usr/share/lib/imq.jar:/usr/share/lib/mps/secv1/jss3.jar:
/usr/sfw/share/lib/xerces-200.jar:. 
com.sun.directory.wps.controller.AgentHarness CNN101
process.delay[2]=120000
process.interval[2]=60000

      

After this change is made, the Identity Synchronization for Windows daemon (on Solaris) or service (on Windows) where the connector is running is stopped and restarted for changes to take effect.

Isolating Problems in Directory Server

For details on concepts and configuration information related to logging options in Directory Server, see the following documents:

Isolating Problems in Message Queue

For information on understanding and configuring the Message Queue Broker's log, see the Message Queue Administration Guide (http://docs.sun.com/db/doc/817-3727).

Isolating Problems in Active Directory

Active Directory logs information to the Directory Service event log on each domain controller. To increase the amount of logging, change the Windows registry entries. There are several diagnostic values under the HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\NTDS\\Diagnostics key. They default to 0 = no logging; other permitted values are: