Windows Update Client Event Id 20499

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Applies to: Windows 10

The following table describes the log files created by Windows Update.

Generating WindowsUpdate.log

To merge and convert WU trace files (.etl files) into a single readable WindowsUpdate.log file, see Get-WindowsUpdateLog.

Note

When you run the Get-WindowsUpdateLog cmdlet, an copy of WindowsUpdate.log file is created as a static log file. It does not update as the old WindowsUpate.log unless you run Get-WindowsUpdateLog again.

Windows Update log components

The WU engine has different component names. The following are some of the most common components that appear in the WindowsUpdate.log file:

• AGENT- Windows Update agent
• AU - Automatic Updates is performing this task
• AUCLNT- Interaction between AU and the logged-on user
• CDM- Device Manager
• CMPRESS- Compression agent
• COMAPI- Windows Update API
• DRIVER- Device driver information
• DTASTOR- Handles database transactions
• EEHNDLER- Expression handler that's used to evaluate update applicability
• HANDLER- Manages the update installers
• MISC- General service information
• OFFLSNC- Detects available updates without network connection
• PARSER- Parses expression information
• PT- Synchronizes updates information to the local datastore
• REPORT- Collects reporting information
• SERVICE- Startup/shutdown of the Automatic Updates service
• SETUP- Installs new versions of the Windows Update client when it is available
• SHUTDWN- Install at shutdown feature
• WUREDIR- The Windows Update redirector files
• WUWEB- The Windows Update ActiveX control
• ProtocolTalker - Client-server sync
• DownloadManager - Creates and monitors payload downloads
• Handler, Setup - Installer handlers (CBS, and so on)
• EEHandler - Evaluating update applicability rules
• DataStore - Caching update data locally
• IdleTimer - Tracking active calls, stopping a service

Note

Many component log messages are invaluable if you are looking for problems in that specific area. However, they can be useless if you don't filter to exclude irrelevant components so that you can focus on what’s important.

Windows Update log structure

The Windows update log structure is separated into four main identities:

• Time Stamps
• Process ID and Thread ID
• Component Name
• Update Identifiers
  • Update ID and Revision Number
  • Revision ID
  • Local ID
  • Inconsistent terminology

The WindowsUpdate.log structure is discussed in the following sections.

Time stamps

The time stamp indicates the time at which the logging occurs.

• Messages are usually in chronological order, but there may be exceptions.
• A pause during a sync can indicate a network problem, even if the scan succeeds.
• A long pause near the end of a scan can indicate a supersedence chain issue.
  

Process ID and thread ID

The Process IDs and Thread IDs are random, and they can vary from log to log and even from service session to service session within the same log.

• The first four hex digits are the process ID.
• The next four hex digits are the thread ID.
• Each component, such as the USO, WU engine, COM API callers, and WU installer handlers, has its own process ID.
  

Component name

Search for and identify the components that are associated with the IDs. Different parts of the WU engine have different component names. Some of them are as follows:

• ProtocolTalker - Client-server sync
• DownloadManager - Creates and monitors payload downloads
• Handler, Setup - Installer handlers (CBS, etc.)
• EEHandler - Evaluating update applicability rules
• DataStore - Caching update data locally
• IdleTimer - Tracking active calls, stopping service

Update identifiers

Update ID and revision number

There are different identifiers for the same update in different contexts. It’s important to know the identifier schemes.

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• Update ID: A GUID (indicated in the previous screen shot) that's assigned to a given update at publication time
• Revision number: A number incremented every time that a given update (that has a given update ID) is modified and republished on a service
• Revision numbers are reused from one update to another (not a unique identifier).
• The update ID and revision number are often shown together as '{GUID}.revision.'

Revision ID

• A Revision ID (do no confuse this with “revision number”) is a serial number that's issued when an update is initially published or revised on a given service.
• An existing update that’s revised keeps the same update ID (GUID), has its revision number incremented (for example, from 100 to 101), but gets a completely new revision ID that is not related to the previous ID.
• Revision IDs are unique on a given update source, but not across multiple sources.
• The same update revision may have completely different revision IDs on WU and WSUS.
• The same revision ID may represent different updates on WU and WSUS.

Local ID

• Local ID is a serial number issued when an update is received from a service by a given WU client
• Usually seen in debug logs, especially involving the local cache for update info (Datastore)
• Different client PCs will assign different Local IDs to the same update
• You can find the local IDs that a client is using by getting the client’s %WINDIR%SoftwareDistributionDatastoreDatastore.edb file

Inconsistent terminology

• Sometimes the logs use terms inconsistently. For example, the InstalledNonLeafUpdateIDs list actually contains revision IDs, not update IDs.

• Recognize IDs by form and context:

  • GUIDs are update IDs
  • Small integers that appear alongside an update ID are revision numbers
  • Large integers are typically revision IDs
  • Small integers (especially in Datastore) can be local IDs

Windows Setup log files analysis using SetupDiag tool

SetupDiag is a diagnostic tool that can be used for analysis of logs related to installation of Windows Updates. For detailed information, see SetupDiag.

Hi there,

We built a XenApp 7.6 site om server 2012 R2 in a 2003 forest functional level domain. Everything seems to be working fine but we keep getting Event ID 20499

'Remote Desktop Services has taken too long to load the user configuration from server <FQDN of a domain controller> for user <username>'

Every time any user starts aan application through Storefront (2.6) or an admin logs in using RDP.

We see an increased start up time in applications. For example an application that used to start in 10 seconds now takes 20. Applications work fine, its only the start up that is slower compared to the old environment (older version of XenApp on 2003 an dusing web-interface)

I am stuck on the idea that the 20499 error is our problem but what can i do to fix it?

I tried to add my servers to the 'Windows Autherization Access group' but that did nothing. Played around with a regkey to disable task offload but no good either.

Could it just be a TCP port? Which ones should be opened between AD and XenApp servers? Eventually everybody logs in fine, just 10 seconds slower and my customer has an excellent monitoring system in place so these 10 seconds extra are an issue..

Appreciate any help