Services Windows XP Services

A list of all the standard services

ServiceName Service (Key) Process Description Default Status & notes
Alerter Alerter Services.exe

[HKLM\SYSTEM\
CurrentControlSet\
Services\Alerter\Parameters]

[HKLM\SYSTEM\
CurrentControlSet
\Services\SysmonLog\Log Queries\<alertname>]
Distribute administrative alerts to specific users or machines.

e.g. Performance Monitor thresholds are distributed as alerts.

Requires the Messenger and Workstation services to be started.
Manual.
May be disabled if the alerts are not needed.
Application Layer Gateway Service ALG alg.exe Support for Internet Connection Sharing and the Internet Connection Firewall Manual
Application Management appmgt Services.exe or svchost.exe Installation services (Add/Remove Programs) - Assign, Publish, and Remove. Manual
Automatic Updates wuaUserv svchost.exe -k wugroup Enable the download and installation of critical Windows updates. Automatic.
If the service is stopped, the operating system can be manually updated at the Windows Update Web site.
Background Intelligent Transfer Service BITS svchost.exe -k BITSgroup Transfer files using idle network bandwidth, maintain file transfers through network disconnections and computer restarts. Automatic
switch to manual if you have problems - Q314862
Clipbook Server Clipsrv Clipsrv.exe Provides support for the Clipbook Viewer, which allows the clipboard of the source machine to be accessed remotely. Disabled
COM+ Event System Event System svchost.exe -k netsvcs Automatic distribution of events to subscribing COM components. Manual
Computer Browser Browser Services.exe Collects the names of NetBIOS resources on the network, creating a list so that it can participate as a master browser or basic browser (one that takes part in browser elections).

This maintained list of resources (computers) is displayed in Network Neighborhood and Server Manager. If disabled you can still map drives, but can't browse the whole network.
Automatic.

If the machine is not connected to a LAN (stand-alone), or will not participate as a master browser or take part in elections, then feel free to change the status to manual (or disabled)

This does not equate to disabling TCP/IP so internet browsing is still possible.
Cryptographic Services CryptSvc svchost.exe Management of Certification Authority certificates. Driver Catalog Database, Protected Root and Key certificate Services. Automatic
DCOM Server Process Launcher DcomLaunch svchost.exe Launch DCOM services Automatic
DHCP Client Dhcp Services.exe or svchost.exe Manage network configuration by registering and updating IP addresses and DNS names. Automatic
On a stand-alone machine: Disable
Distributed Link Tracking Client TrkWks Services.exe or svchost.exe Send notification of files moving between NTFS volumes in a network domain. Automatic
Can be set to manual if you dont need this function.
Distributed Transaction Coordinator msdtc MSDTC.exe Coordinate transactions that are distributed across two or more databases, message queues, file systems, or other transaction protected resource managers. Manual
Can be set to Disabled if you dont need this function.
DNS Client Dnscache Services.exe Resolves and caches Domain Name System (DNS) names. Automatic
Directory Replicator (Server only) Replicator Lmrepl.exe Replicate specified files & folders between computers.
The host is the export server, and the target machines are called import computers.
Replication is configured under Server in the Control Panel.
Automatic

Domain Controllers need this to replicate the Netlogon share.
Error Reporting Service Ersvc svchost.exe Report errors back to Microsoft in Redmond. Automatic
If you never want to report system crash info. to Microsoft set this to disabled.
EventLog EventLog Services.exe Record System, Security, and Application Events.

Viewed with the MMC Event Viewer (eventvwr.exe in NT).
Automatic
Fast User Switching Compatibility FastUserSwitching Compatibility > svchost.exe Enable multiple users to login to the same PC simultaneously. Manual
Fax Service Fax faxsvc.exe Send and receive faxes Automatic or Manual
Help and Support helpsvc svchost.exe Help and Support Center Automatic.
If stopped the help system will stop working.
Human Interface Device Access HidServ svchost.exe Support for extra keyboard 'hot buttons' and other multimedia input devices. Disabled
HTTP SSL HTTPFilter svchost.exe Support for HTTPS (Secure Socket Layer) websites such as banking and e-commerce. Manual
IMAPI CD-Burning COM Service ImapiService imapi.exe CD-Rom Burning Manual
If you have problems changing to Automatic may help.
Indexing Service cisvc cisvc.exe Index the contents and properties of files on local and remote computers.
[ RESOURCE HOG ]
Manual
For improved performance Disable or
Uninstall thru C.Panel add/remove
IPSEC Policy Agent PolicyAgent lsass.exe Manage IP security policy and starts the ISAKMP/Oakley (IKE) and the IP security driver. Automatic
May be changed to Manual if IPSec is not needed.
License Logging Service (Server) LicenseService Llssrv.exe License tracking on a server or DC (Domain Controller). If disabled then licensing status alerts will not be generated.
Logical Disk Manager Dmserver services.exe or svchost.exe Required by the MMC Disk Management plug-in. Automatic
Logical Disk Manager Administrative Service Dmadmin dmadmin.exe /com Administrative service for disk management requests Manual
Message Queuing   mqsvc.exe Message Queuing  
Message Queuing Triggers   mqtgsvc.exe Message Queuing  
MS Software Shadow Copy Provider Service swprv dllhost.exe Microsoft Backup Utility Manual
Disable if you never use Shadow Copy features.
Messenger Messenger Services.exe Process the receipt or delivery of pop-up messages sent via NET SEND.
Not related to Windows Messenger

Disabled
vulnerability once used to send pop-up spam.

Network Connections Netman svchost.exe -k netsvcs Manage objects in the Network and Dial-Up Connections folder (LAN and remote connections.) Manual
Net Logon Netlogon Lsass.exe
(Local Security Authority Subsystem)
Network Authentication: maintains a synced domain directory database between the PDC and BDC(s), handles authentication of respective accounts on the DCs, and authenticates domain accounts on networked machines.
Automatic
For stand-alone machines never connected to a domain set to Manual.
NetMeeting Remote Desktop Sharing Nmnsrvc mnmsrvc.exe Allows authorized people to remotely access your Windows desktop using NetMeeting. Manual.
A good idea to Disable unless you plan to allow remote connections.
Network DDE NetDDE Netdde.exe Support the network transport of DDE (Dynamic Data Exchange) connections.
Requires Network DDE DSDM to be started. See Clipbook service
Disabled
Network DDE DSDM NetDDEdsdm Netdde.exe Manage shared DDE conversations (from shares like: \\computername\ndde$).
See Clipbook service

Disabled

NLA - Network Location Awareness nla svchost.exe Part of Internet Connection Sharing (ICS) and the Internet Connection Firewall (ICF) Manual
Network Provisioning Service xmlprov svchost.exe Manage XML configuration files on a domain basis Manual
NT LM Security Support Provider NtLmSsp Services.exe Extends NT security to Remote Procedure Call (RPC) programs using various transports other than named pipes.
RPC activity is quite common, and most RPC apps don’t use named pipes.
Manual
Performance Logs and Alerts (XP)

Alerts and Performance Logs (Win 2K)
sysmonLog smlogsvc.exe Configure performance logs and alerts. Manual. May be disabled if the alerts are not needed.
Plug and Play PlugPlay Services.exe Plug and Play.
Do not disable this service.
Automatic
Universal Plug and Play Host UPNPhost svchost.exe Device Host detect and configure external UPnP devices.
UPnP<>PnP

Manual

Portable Media Serial Number Service WmdmPmSN svchost.exe Retrieves the serial number of any portable media player connected to this computer. Manual
Disable if you never use DRM music devices.
Print Spooler or Spooler
Spooler Spoolsv.exe
(Spoolss.exe in NT4)
The NT printing subsystem. Automatic - If you print documents.

If no printing is ever done set to manual (or disabled)

Restarting this service will cancel all pending print jobs.
Protected Storage ProtectedStorage Pstores.exe Encrypt and store secure info: SSL certificates, passwords for Outlook, Outlook Express, Profile Assistant, MS Wallet, and digitally signed S/MIME keys. Automatic.
QoS RSVP rsvp rsvp.exe -s Provide network signaling and local traffic control setup functionality for QoS-aware programs and control applets. Manual
Remote Access Auto Connection Manager
or
Remote Access AutoDial Manager
Rasauto svchost.exe -k netsvcs Activates automatic dial-up when a URL link is clicked.

Required for some but not all RAS, ADSL or Cable connections.
Manual
May be disabled if the machine has no internet access.
Remote Access Connection Manager Rasman svchost.exe -k netsvcs Required for most but not all RAS, ADSL or Cable connections. Manual.
Required for Internet Connection Sharing or accessing remote servers via RAS.
Remote Desktop Help Session Manager RDSessMgr sessmgr.exe Remote Desktop Help Session Manager. Manual
May be disabled if RDP is never used.
Remote Procedure Call (RPC) Service
or
Remote Procedure Call (RPC)
RpcSs svchost -k rpcss This RPC subsystem is crucial to the operations of any RPC activities taking place on a system (e.g. DCOM) Automatic
Do not disable

Many essential services are dependent on RPC.
Remote Procedure Call (RPC) Locator RpcLocator Locator.exe Maintain the RPC name server database, requires the RPC service (below) to be started. Database of available server applications. Manual.
Remote Registry Service (XP Pro only) RemoteRegistry regsvc.exe Allow remote registry manipulation. Automatic
A good idea to disable this, unless you have some reason to allow remote registry editing.
Removable Storage Ntmssvc svchost.exe -k netsvcs Manage removable media, drives, and libraries. Manual.
RIP Listener
(XP - option)
    Listen for RIP announcements from routers and modify the routing table accordingly. To use the RIP Listener service, your adjacent routers must support the RIP v1 protocol. You'll find the RIP Listener service under Add/Remove Windows Components - Networking Services.
Routing and Remote Access RemoteAccess svchost.exe -k netsvcs Allow incoming connections via dial in or VPN. (WAN Routing) Disabled
Secondary Logon (Win XP)
RunAs (Win 2K)
secLogon services.exe or svchost.exe Enables starting processes under alternate credentials. Automatic
You may want to stop this service if you never use RunAs
Security Accounts Manager (Win 2K) SamSs lsass.exe Stores security information for local user accounts. Automatic
Security Center wscsvc svchost.exe Monitor system security settings and configurations. Automatic
You may want to disable this if firewall and virus updates are controlled via other means.
Server LanmanServer Services.exe Support for peer-to peer file sharing, print sharing, and named pipe sharing via SMB services.
Automatic
May be disabled if you dont host file or print shares. (Admin$ shares)
Shell Hardware Detection ShellHWDetection svchost.exe CD Autoplay Automatic.
Smart Card ScardSrv SCardSvr.exe Manages and controls access to a smart card inserted into a smart card reader attached to the computer. Manual
If you never use smart cards, Disable
Smart Card Helper ScardDrv SCardSvr.exe legacy smart card readers Removed in XP SP2
SNMP Service Snmp snmp.exe Agents that monitor the activity in network devices and report to the network console workstation. Automatic (if installed)
SSDP Discovery Service SSDPSRV svchost.exe Simple Service Discovery Protocol.
Enables discovery of UPnP devices on your home network
Manual
May be disabled if as is likely you dont have any UPnP devices)
System Event Notification SENS svchost.exe -k netsvcs Track system events such as Windows logon, network, and power events.
Notifiy COM+ Event System subscribers of these events.
Automatic.
System Restore Service srservice svchost.exe Creates system snap shots.
[ RESOURCE HOG ]
Automatic

If the machine's configuration has been cloned/backed up - turn off System Restore in Control Panel, System.
Task Scheduler or Schedule Schedule atsvc.exe or mstask.exe This service is required to schedule background tasks (run at a specific date & time)

Under NT it's a Resource Hog.
Under XP it's used by some auto-tuning operations.
Automatic
TCP/IP NetBIOS Helper
or
TCP/IP NetBIOS Helper Service
lmHosts Services.exe Support for name resolution in a Windows 2000 domain. (Netbios/Wins)
An alternative to DNS lookup.
Automatic
If not required may be set to manual.
Telephony TapiSrv Tapisrv.exe Telephony API (TAPI) support for programs that control telephony devices and IP based voice connections. e.g unimodem modems. Manual
Telnet
(Win 2K)
TlntSvr tlntsvr.exe Allows a remote user to log on to the system and run console programs using the command line. Disabled
Very insecure, presents a security risk when running.
Terminal Services TermService svchost.exe Required for Fast User Switching, Remote Desktop and Remote Assistance Manual
If not required may be Disabled
Themes Themes svchost.exe XP Active Desktop Themes, and quick launch toolbars
[ RESOURCE HOG ]
Automatic
Set to Manual or Disabled if you dont like themes.
UPS or Uninterruptible Power Supply UPS Ups.exe Support for an Uninteruptable Power Supply (UPS) physically connected to the machine. Manual
Not every UPS will need or use this service.
Universal Plug and Play Host UPNPhost svchost.exe Device Host detect and configure external UPnP devices.
UPnP<>PnP
Manual
Upload Manager uploadmgr svchost.exe Upload Manager. Removed in XP SP2
Volume Shadow Copy VSS vssvc.exe MS Backup - A volume shadow copy is a picture of the volume at a particular moment in time. That means a computer can be backed up while files are open and applications running. Manual
If not required may be disabled
see MS Software Shadow Copy Provider Service
WebClient WebClient svchost.exe Allow access to web-resident disk storage from an ISP. WebDAV "internet disks" such as Apple's iDisk. Automatic
If not required may be disabled
Windows Audio AudioSrv svchost.exe Sound Driver
Note that disabling the sound driver won't stop sounds from playing - you just won't hear them.
Automatic
If no sound card fitted then disable.

Windows Firewall (XP SP2)

Internet Connection Firewall (XP)

Internet Connection Sharing (Win 2K)

SharedAccess svchost.exe -k netsvcs Network address translation, addressing, and name resolution services for all computers on your home network through a dial-up connection. Automatic.
For better protection consider adding a third party firewall.
Windows Image Acquisition stisvc svchost.exe Required for some but not all cameras, scanners, and digital video cameras. Manual
Windows Installer MSIServer MsiExec.exe /V Install, repair and remove software according to instructions contained in .MSI files. Manual
Windows Management Instrumentation WinMgmt C:\WINNT\System32
\WBEM\WinMgmt.exe
WMI provides system management information. Automatic
Windows Management Instrumentation Driver Extensions Wmi svchost.exe Provides systems management information to and from drivers. Manual
Windows Time W32time services.exe Update the computer clock by reference to an internet time source or a time server. Automatic
Wireless Zero Configuration WZCSVC svchost.exe Configure wireless network devices (802.11a/b/g). Automatic
disable if you don’t have any wireless devices.
WMI Performance Adapter WmiApSrv wmiapsrv.exe Collect performance library information. Manual
Workstation lanmanworkstation Services.exe Communications and network connections.
Services dependent on this being started: Alerter, Messenger, and Net Logon.
Automatic

Before changing any of the defaults - use the links above to find what exactly the service does. The Elder Geek also has some good advice about services.

It is inadvisable to disable a service without being aware of the consequences, always start by setting the service to manual, reboot and test for any problems.

A service set to manual may be automatically restarted if another service is dependent on it.
A service set to disabled will not restart even if it's required to boot the machine!

Stopping or disabling a service will generally save a small amount of memory and will reduce the number of software interrupts (cpu message queue.) The main reason for tinkering with services is to harden the system against security vulnerabilities. Disable everything that you don’t need or use - then any future problems with those services cannot affect the machine.

To document all the services currently installed:

SC QUERY state= all |findstr "DISPLAY_NAME STATE" >my_services.csv

Some XP services communicate and send data directly to Microsoft, this is not generally something to lose sleep over. Managing the running of these services may be a consideration if confidentiality or anonymity is highly important to you.

Removing a service completely

To delete a service use the SC delete command:

SC delete NameofServiceTodelete

Built-in Service Accounts

In addition to other Default User & Group accounts there are 3 built-in accounts, designed for running background services.

Local Service Account (NT AUTHORITY\LOCAL SERVICE) - has the same level of access to resources and objects as members of the Users group. This limited access helps safeguard the system if individual services or processes are compromised. Services that run as the Local Service account access network resources as a null session without credentials. (This account is not supported for running SQL Server services.)

Network Service Account (NT AUTHORITY\NETWORK SERVICE) - has more access to resources and objects than members of the Users group. Services that run as the Network Service account access network resources by using the credentials of the computer account.

Local System Account (NT AUTHORITY\SYSTEM) - a very high-privileged built-in account. It has extensive privileges on the local system and acts as the computer on the network.

Windows 2008 introduced a new feature: Managed Service Accounts these provide automatic password management and simplified service principal name (SPN) management. Service accounts are created in PowerShell with New-ADServiceAccount

Enable or Disable Ports
Many services and applications rely on the use of a specific PORT - to determine if a particular port is enabled for use, review the list of Service names and port numbers held in the "services" file ('windows\system32\drivers\etc\services')
Installing a good firewall is the easiest way to manage this.

“The service we render to others is really the rent we pay for our room on this earth. It is obvious that man is himself a traveler; that the purpose of this world is not 'to have and to hold' but 'to give and serve.' There can be no other meaning” - Sir Wilfred T. Grenfell

Related:

SC - Service Control
TASKLIST - List running tasks and services
WinMSD - List running services
ServiceStatus.ps1 - List all services (Powershell)
Safe Mode - Press F8 during bootup to start with mimimal services running.
Recovery - The Recovery Console
WMIC SERVICE - WMI access to services
DRIVERQUERY - display device drivers and properties (Resource Kit)
DComCnfg - Disable/configure DCOM
Microsoft.com - WinXP services - default settings
Microsoft.com - Win2003 services - 138 page Word Doc
Microsoft.com - Managing System Services.doc - 2003
The Elder Geek - Services Guide
The Register - Part 1 & 2 - Review of Win XP Services
Sysinternals - how to disable every service
SecurityFocus - Securing Windows Services
Wikipedia - Windows service
Q137890 - SRVANY - create a User-Defined Service
Q288129 - Grant users the right to manage services
Q263201 - Default Processes
Q244905 - How to disable a service at boot
Q314056 - What is SvcHost
Q825826 - Troubleshoot missing network connection icons


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