If AutoCAD displays messages such as “Your AutoCAD license is not valid”, “Validation Failed”, “License checkout timed out”, “Unable to Verify Access”, or “Autodesk Genuine Service Alert”, the problem is often caused by corrupted licensing files, damaged authentication tokens, blocked network communication, outdated Autodesk components, or Windows configuration issues.

In many cases, the subscription itself remains fully valid.

This guide covers the complete troubleshooting process used by CAD managers, Autodesk administrators, and IT support teams to restore licensing validation on AutoCAD 2024, 2025, and 2026.

Common AutoCAD Genuine Service Error Messages

You may encounter one or more of the following messages:

• Your AutoCAD license is not valid
• License checkout timed out
• Validation Failed
• Autodesk Genuine Service Alert
• License Manager is not functioning
• Unable to Verify Access
• Sign In Required
• Subscription validation failed

If your Autodesk subscription is active, proceed through the steps below in order.

Step 1: Verify Your Autodesk Subscription

Before modifying licensing files or reinstalling components, confirm that the Autodesk subscription is assigned correctly.

What to Check

1. Sign in to your Autodesk Account.
2. Open Products and Services.
3. Verify:
   • AutoCAD subscription is active
   • The correct user is assigned
   • The subscription has not expired
   • A seat is available

Why This Matters

A valid subscription assigned to another Autodesk account can trigger validation failures even though the subscription itself remains active.

Step 2: Synchronize Windows Date and Time

Autodesk licensing relies on encrypted authentication tokens that include time-sensitive validation information.

Even a small clock discrepancy can invalidate those tokens.

Procedure

1. Right-click the Windows clock

Select:

Adjust date and time

2. Enable automatic synchronization

Turn on:

• Set time automatically
• Set time zone automatically

3. Force synchronization

Click:

Sync now

4. Restart AutoCAD

Test whether the validation error disappears.

Step 3: Sign Out and Sign Back In

Authentication tokens occasionally become corrupted.

Refreshing the Autodesk session often resolves validation issues immediately.

Procedure

1. Open AutoCAD

2. Click your profile icon

Located in the upper-right corner.

3. Select Sign Out

4. Close AutoCAD completely

5. Launch AutoCAD again

6. Sign in using your Autodesk account

A new authentication token will be generated automatically.

Step 4: Update Autodesk Access and Autodesk Components

Many validation issues are fixed by updating Autodesk infrastructure components.

Procedure

1. Open Autodesk Access

2. Click Check for Updates

3. Install all available updates

Pay particular attention to:

• Autodesk Licensing Service
• Autodesk Genuine Service
• Autodesk Identity Manager
• ODIS (On-Demand Installation Service)

4. Restart Windows

Step 5: Verify Autodesk Licensing Services

AutoCAD relies on background licensing services to validate subscriptions.

Procedure

1. Press Windows + R

2. Type

services.msc

3. Press Enter

4. Locate

Autodesk Desktop Licensing Service

5. Verify

• Status = Running
• Startup Type = Automatic

If the Service Is Stopped

1. Right-click the service

2. Select Start

3. Open Properties

4. Set Startup Type to Automatic

5. Restart AutoCAD

Step 6: Restart Autodesk Licensing Components

Sometimes the licensing service becomes unresponsive even though it appears healthy.

Restart AdskLicensingService

1. Open Command Prompt as Administrator

2. Run

net stop AdskLicensingService
net start AdskLicensingService

Restart Autodesk Genuine Service Components

Unlike AdskLicensingService, Autodesk Genuine Service is not typically exposed as a permanently running Windows service named “Autodesk Genuine Service” inside services.msc.

Instead, it operates through background processes such as:

AGSService.exe

and scheduled tasks.

Recommended Action

Option A

Restart Windows.

Option B

Open Task Manager and terminate:

AGSService.exe

If running.

Then relaunch AutoCAD.

Step 7: Reset FLEXnet Licensing Files

Corrupted FLEXnet files can prevent successful license validation.

Procedure

1. Close all Autodesk applications

2. Open

C:\ProgramData\FLEXnet

3. Locate Autodesk FLEXnet files

Examples:

adskflex_00691b00_tsf.data
adskflex_00691b00_tsf.data_backup

Important

Delete only files matching:

adskflex_*_tsf.data

Do not delete unrelated FLEXnet files or folders used by other software vendors.

4. Restart AutoCAD

New licensing files will be created automatically.

Step 8: Reset Autodesk Licensing Data

Autodesk provides dedicated tools to repair licensing records.

Verify License Status

Open an elevated Command Prompt and run:

AdskLicensingSupportTool.exe -s

This displays:

• License status
• Product registration
• Expiration information
• Subscription status

Reset Licensing Information

You may use the Reset Security Logic option inside the Autodesk Licensing Support Tool.

For administrators performing command-line repairs, Autodesk also provides licensing helper tools capable of resetting product registrations.

Example syntax:

AdskLicensingInstHelper.exe change -pk 001R1 -pv 2026.0.0.F -m ""

Product keys and versions vary depending on the installed Autodesk product.

After resetting licensing data, restart Windows and launch AutoCAD again.

Step 9: Clear Autodesk Identity Cache

Corrupted identity tokens are one of the most common causes of recurring validation failures.

Procedure

1. Close all Autodesk applications

2. Delete the contents of

%LocalAppData%\Autodesk\Identity Services

3. Delete the contents of

%LocalAppData%\Autodesk\Web Services

Important

Delete only the contents.

Do not remove the parent folders.

4. Restart AutoCAD

Fresh authentication tokens will be generated automatically.

Step 10: Reinstall Autodesk Licensing Service

If licensing files become damaged, reinstalling the licensing service often resolves the issue.

Procedure

1. Navigate to

C:\Program Files (x86)\Common Files\Autodesk Shared\AdskLicensing

2. Run

uninstall.exe

as Administrator.

3. Download the latest Autodesk Licensing Service

4. Install the new version

5. Restart Windows

Step 11: Reinstall Autodesk Identity Manager

AutoCAD 2024–2026 relies heavily on Autodesk Identity Manager for cloud authentication.

Procedure

1. Open Programs and Features

2. Locate

Autodesk Identity Manager

3. Uninstall it

4. Install the latest version

5. Restart Windows

Verify Microsoft Edge WebView2 Runtime

Identity Manager depends on Microsoft Edge WebView2 Runtime to display Autodesk sign-in pages.

If WebView2 becomes damaged, users often experience:

• Blank login windows
• Endless loading loops
• Authentication failures
• Missing sign-in prompts

Verification Procedure

1. Open Installed Apps

2. Locate

Microsoft Edge WebView2 Runtime

3. Repair or update the installation if necessary

Step 12: Inspect the Windows Hosts File

Network blocks inside the hosts file can prevent Autodesk validation servers from being reached.

Procedure

1. Open

C:\Windows\System32\drivers\etc\hosts

using Notepad running as Administrator.

2. Search for

autodesk

genuine-software.autodesk.com

api.autodesk.com

3. Remove blocking entries

4. Save the file

5. Restart Windows

Step 13: Verify Firewall, Antivirus, and SSL Inspection

Security software frequently blocks Autodesk licensing traffic.

Add Antivirus Exclusions

Exclude:

C:\Program Files\Autodesk

and

C:\Program Files (x86)\Common Files\Autodesk Shared

Allow Autodesk Domains

Ensure access to:

*.autodesk.com

genuine-software.autodesk.com

genuine-software2.autodesk.com

api.autodesk.com

Corporate Networks

Disable SSL inspection or certificate interception for Autodesk domains.

Modified certificates often break authentication.

Step 14: Check Proxy Configuration

Old proxy settings frequently remain after VPN software or security tools have been removed.

Procedure

1. Open Command Prompt as Administrator

2. Run

netsh winhttp show proxy

3. Review the configuration

If Unwanted Proxy Entries Exist

Run:

netsh winhttp reset proxy

4. Restart Windows

Step 15: Disable VPN Software Temporarily

VPN software can interfere with Autodesk licensing traffic.

Common examples include:

• NordVPN
• Cisco AnyConnect
• FortiClient
• GlobalProtect
• OpenVPN

Procedure

1. Disconnect the VPN

2. Restart Windows

3. Launch AutoCAD

4. Test license validation

If the error disappears, configure Autodesk exclusions within the VPN software.

Step 16: Verify TLS Security Settings

Older systems occasionally use outdated encryption protocols.

Procedure

1. Open Internet Options

2. Select Advanced

3. Scroll to Security

4. Verify

• TLS 1.2 enabled
• TLS 1.3 enabled (if available)

5. Restart Windows

Step 17: Repair ODIS (Autodesk On-Demand Installation Service)

ODIS manages installation, updates, and several licensing interactions.

A damaged ODIS installation can trigger validation failures.

Procedure

1. Navigate to

C:\Program Files\Autodesk\AdODIS\V1

2. Run

RemoveODIS.exe

as Administrator.

3. Reinstall Autodesk Access or the latest Autodesk installer package

4. Restart Windows

Step 18: Perform a Clean Reinstallation

If all previous steps fail, perform a complete clean reinstall.

Phase 1 – Remove AutoCAD Components

1. Uninstall AutoCAD

2. Uninstall Autodesk Licensing Service

3. Uninstall Autodesk Identity Manager

4. Remove Autodesk Genuine Service if Autodesk Support recommends it

Avoid removing unrelated Autodesk applications that are functioning normally.

Phase 2 – Remove Autodesk FLEXnet Cache

Navigate to:

C:\ProgramData\FLEXnet

Delete only:

adskflex_*_tsf.data

files.

Phase 3 – Reinstall AutoCAD

1. Download the installer from Autodesk Account

2. Choose Direct Download whenever available

3. Install locally

4. Restart Windows

5. Launch AutoCAD and sign in

Advanced Troubleshooting (Legacy Method)

Some older Autodesk licensing frameworks reference:

C:\ProgramData\Autodesk\Adlm\ProductInformation.pit

Warning

This method should be considered a last resort.

Renaming or deleting this file does not affect only AutoCAD.

It can invalidate registration data for all Autodesk products installed on the workstation, including:

• Revit
• Civil 3D
• Inventor
• Maya
• 3ds Max
• Navisworks

Users may subsequently be forced to repair or reinstall multiple Autodesk applications.

If Autodesk Support Specifically Instructs You

Rename:

ProductInformation.pit

to:

ProductInformation.pit.old

Restart Windows and test licensing again.

Do not use this method on production workstations without first creating a backup.

Silent Deployment for IT Administrators

Large organizations often manage Autodesk licensing components through automated deployment systems.

Many Autodesk installers support unattended installation modes.

Example:

setup.exe --mode unattended

This approach simplifies large-scale deployment of:

• Autodesk Licensing Service
• Autodesk Identity Manager
• Autodesk Genuine Service
• ODIS

Always test unattended deployments on a pilot workstation before rolling them out company-wide.

Preventing Future Validation Errors

To reduce future licensing problems:

• Keep Autodesk Access updated.
• Keep Autodesk Licensing Service updated.
• Keep Autodesk Identity Manager updated.
• Keep Microsoft Edge WebView2 Runtime updated.
• Avoid registry cleaning tools.
• Avoid manually deleting Autodesk licensing files.
• Keep Windows time synchronized automatically.
• Avoid blocking Autodesk domains.
• Restart workstations after Autodesk updates.
• Review VPN and firewall policies periodically.

Quick Diagnostic Table

FAQ

Can I uninstall Autodesk Genuine Service?

Modern Autodesk products expect Autodesk Genuine Service to be present. Permanently removing it often leads to recurring validation warnings and compliance checks.

Why does AutoCAD say my license is not valid even though my subscription is active?

The most common causes are corrupted authentication tokens, damaged licensing files, blocked Autodesk servers, Identity Manager issues, or network security software interfering with validation.

Does Autodesk Genuine Service require an internet connection?

Subscription-based Autodesk licenses can continue working offline for a limited period.

For most single-user subscriptions, Autodesk allows offline operation for approximately 30 days. After that period, the workstation must reconnect to Autodesk servers to renew validation data.

How do I reset Autodesk licensing?

Use the Autodesk Licensing Support Tool, reset licensing information, clear FLEXnet cache files, restart licensing services, and sign in again.

Why does the validation error return after every reboot?

Recurring validation failures usually indicate damaged Identity Manager components, corrupted authentication caches, blocked Autodesk domains, WebView2 issues, proxy misconfiguration, or security software interference.