KLR Login Service 137: What It Actually Is

People most commonly encounter “KLR Login Service 137” while hunting through Windows Event Viewer or when they see something strange during login. It looks technical, a little scary, even. But part of the point of this article is to show you what‘s really going on so that it‘s not even a little scary.

Here‘s the low-down on what this means, why you should care and what you should do about it whether you‘re a general user that doesn‘t really think about the administrative crap or if you run a dozen different phones.

Table of Contents

The Event Log Nobody Explains Clearly

Windows is always recording things in the background. Most people will never see it. But when something a little odd occurs at startup or login, a record is created and that record can be quite frightening.

The KLR Login Service 137 appears by default as a logged event associated with Windows Authentication implementation. It is related to Windows over Microsoft technologies for user login information, Session tokens, and sessions login sequence coming from domain and enterprise networks and custom security solutions.

Number “137” is actually an event ID. Windows categorizes various system events by numbers, and 137 is typically related to kernel power/session management layer what‘s happening inside Windows when you‘re typing in your password versus waiting to see your desktop.

I found this entry on a mid-range Dell laptop running Windows 10 following a forced shutdown. The system navigated to the login screen but when checking the log there was a service warning associated with this identifier. No obvious failures occurred but the log entry was present.

Why It Appears (The Non-Technical Version)

Here‘s what actually triggers it in most cases:

Can be caused by… Interrupted updates or shutdown If Windows was in the middle of updating system files and was interrupted, the next time you log in Windows may report the file inconsistencies.
Third-party security/login software – Antivirus software, VPN applications or login managers provided by the company can occasionally cause service warnings by messing around with the Windows login layer.
Domain or network authentication failure If you‘re on a work or school network, and your computer can‘t find the authentication server in time, the login service will log the failure.
Driver conflicts at session startup A few drivers initialize at login. One crashing or not-updated can generate service-layer events.
Account permission mismatches — Particularly on shared or newly migrated machines where the user profile may not fully correspond to the permissions.

None of these are called serious cases automatically. But it‘s always worth certain to be double-checked, rather than disregarded.

My Take After Digging Into This for a Few Days

I then took a brief look at some other Windows 10 builds and a couple of Windows 11 systems to compare this event occurrence. Here‘s what I found that most generalized guides ignore.

First, the KLR prefix isn‘t a Windows native login. It‘s usually associated with an outside party, either a vendor login manager added atop Windows authentication, or occasionally, a third-party login tool. Lenovo machines have had dozen of variants, a consequence of their software bundle. If you‘re using a branded box – HP, Lenovo, Dell – see if you have a vendor login tool installed, and the last time it was changed.

Second, the event ID 137 by itself doesn‘t mean very much without examining the source column in Event Viewer. That name of the source will give you an indication if this is a Windows kernel event, a third party application event, or related to your network configuration. Most articles don‘t mention this, and it is the most practical step.

To check:

Open Event Viewer (Search in start menu or run Eventvwr).
Go to Windows Logs → System
Filter by Event ID 137
Examine the Source column located on the right

That source name is how you actually begin your fix.

When It‘s Fine to Leave It Alone

Not all logged events require action. Windows is a noisy system it logs things all the time, many of which are low level warnings that tend to fix themselves.

KLR Login Service 137 is probably not worth worrying about if:

The computer is able to boot up and login without any visible problems, a login screen appears.
The entry is present only once or twice in a spell, so entirely useless >
It occurred following a lapse in time that was not explained (one time event such as a power outage, forced restart,)
Performance, apps and network access all feel normal.

System logs are not alarm systems but diagnostic tools. An old warning journal entry from a week ago does not imply it is infected or broken.

When You Should Actually Do Something

Situations do exist where this event needs to be acted upon.

If it‘s showing up on every login — that‘s a pattern, not a bug. One source spamming the same entries indicates that somewhere in the login chain, something is missing.

If you’re also experiencing:

Slow login (>30–45 seconds to become on desktop)
Network or domain connection issues: There is a problem establishing a reliable network or domain connection.
Multiple login failures, requiring several attempts.
Failed to start after logging in:

…then the event log is referring to a real problem, not a ghost.

My own experience proved that on one domain connected machine, 137 successive events related to the same GPO (Group Policy Object) that was misconfigured after a server migration. While the login would work, three background services silently failed on every login.

What to Do If It‘s Causing Problems

Step 1 Can I see the Source name in Event ViewerAlready covered earlier, but this is really the first step. You need to know who you are trying to manage before you are able to manage it.

Step 2 Run the windows login and boot troubleshooterHead to Settings -> Update & Security -> Troubleshoot -> Additional troubleshooters. It won‘t always find service-layer problems, but it eliminates the most obvious ones quickly.

Step 3 update or revert relevant drivers If the Event Viewer source goes to a driver name then open up Device Manager and check for driver update on that device. Or, if this began after a driver was recently updated, do a driver rollback.

Step 4 Verify Startup ServicesOpen Task Manager then select the Startup tab. Check for anyguiltyg programs that are set to “Enable”. Itemscan sometimes install third-party login managers that are configured as startup services and interfere with Windows native authentication.

Step 5 Repair System FilesRun this in Command Prompt (Admin):

sfc /scannow

Then follow it with:

DISM /Online /Cleanup-Image /RestoreHealth

These are the two commands to scan & repair Windows system files if the login services are not working: I have used this combination on several machines and the recurring event logs appeared to result from a corrupt Windows update.

Step 6 Check for vendor software conflictsIf you are using a Lenovo, HP or Dell machine, review your installed apps list and check for anything with login, security, credential or identity in the title. Vendor-specific login utilities (such as sign-in security utilities in Lenovo Vantage or HP Sure Sign) can conflict with Windows Hello or the Windows login services.

Removing or disabling these tools temporarily can tell you if they are the root of the problem.

The Locked Machine Scenario

This event can also be more pertinent in certain situations, such as when working on a Windows box that is currently and/or will not unlock. If you are seeing KLR Login Service 137 showing up with the login requests failing, then you‘re probably getting hung up at the lock screen.

If in that situation you‘re wondering what to do next, I suggest reading a helpful article: What Should Do With A Locked Windows 10 Computer, it discusses ways around recovery options like starting in safe mode, resetting your account and/or when to use a Windows recovery disk.

Knowing the service error and whether you have account recovery options will combine to give you a more complete idea of what is really happening.

What Most People Get Wrong About Event IDs

Here‘s a rookie mistake: Applying that same level of seriousness to every Event Viewer event.

Windows produces hundreds of log entries every day. Warning does not mean error. Error does not mean failure. Critical is uncommon and that doesn‘t even guarantee that something has gone wrong from the user‘s point of view.

Specifically, Event ID 137 has been seen on Windows systems, starting from Windows 7 and prior. It‘s not a new event. It doesn‘t inherently point to malware, hardware fail, or an imminent death of your system. Its most common cause is a service that wasn‘t able to finish what it was doing within a deadline Windows apparently set and hence it wrote to the event log.

The value of knowing this in the real world is simply the context. Should something indeed go wrong – sluggish login, service down, account locked out – having this entry in your history helps IT support or a computer related friend get somewhere quicker.

Enterprise vs. Personal Machine Different Stakes

In this case, this means that individuals operating on personal machines find this event to be a relatively minor annoyance.

This is not the case if you are an IT admin managing many Windows boxes on a domain. If the same event id 137 fires repeatedly on multiple endpoints it might be a problem with:

The response time of the domain controller
GPO deployment issues
Credential caching errors when the machine is not available
Old login scripts not functioning properly on new Windows builds

And in some of those examples, your monitoring systems such as Windows Event Forwarding or some third party SIEM solutions should be grabbing these automatically. It‘s probably worth looking into a pattern on several points at the infrastructure level – not only on each machine.

Two Things Worth Knowing That Most Articles Skip

1. KLR events can be vendor-specific telemetry, not Windows errors

Another OEM trick is to name their custom logging components differently and run their own services to make sure all the logs go in the same log folder. “KLR” could very well be a manufacturer-specific service ( security package, logon package, etc) that replaces the “OEM” one, not Windows. Search your Services list (services.msc) with “KLR” and if the real Windows service is for instance called “OEM log”, you found the real reason.

2. Event ID 137 behaves differently across Windows builds

On Windows 10 21H2 and earlier, this event occurred more frequently in the context of login failures related to the Credential Manager. On newer builds (22H2 and Windows 11), Microsoft changed the way session tokens are managed, so the same underlying problem might issue a different event ID altogether. Upgrading recently and seeing the 137 events stop, it may have been ‘fixed’ upstream…

The Honest Summary

KLR Login Service 137: As with most IIS 6.0 logs in the background, 137 might seem as scary as it first appears. For most that‘s probably just a symptom of a background IIS 6.0 log entry related to a small service glitch that sorted itself out or that your system has been coyly getting around.

If login is functioning correctly and anything isn‘t feeling like its a total disaster, write it down and keep going to the next thing.

This is showing in conjunction with real login issues, take a closer look at the Event Viewer source, review your startup services and execute the system repair commands. This resolves most situations.

And if you‘re on work or school machine, let someone who manages network know it. As it‘s probably one of a configuration problem they already know about.

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