FATAL ERROR: Unhandled Access Violation Reading 0x0000 Exception at 4048b9h!!

Auto Desk Autocad LT FATAL ERROR: Unhandled Access Violation Reading 0x0000 Exception at 4048b9h


When you tried to launch AutoCAD, the following error message was displayed and the product would not run.

error message


This error message indicates that the program installation has become corrupted. To correct the issue, the software needs to be reinstalled. This error occurs when certain files become locked during the uninstall/reinstall process. To reinstall AutoCAD correctly:

  1. Disable Digital Signatures:
    • On the Windows Start menu, enter acsignopt in the Search programs and files field and press Enter.
    • Clear the Validate Digital Signatures and Display Special Icons option.


2: Completely remove Autodesk software and reinstall.




Auto Desk Desktop Subscription Licensing Error: “Establish an Internet connection to continue!!

Subscription Licensing Error: “Establish an Internet connection to continue”


When you try to start the program, the following error is displayed: 

Establish an Internet connection to continue
The Auto desk license server cannot be found.  This problem can be caused by a variety of issues, including:

  • Internet connectivity has been lost.
  • The Auto desk license server is temporarily unavailable.


  • Security vulnerability that requires a licensing hotfix
  • Network connectivity blocked by a proxy server
  • Trovi or WAJAM preventing connection to the licensing server


Apply Security Hotfix and Troubleshoot Connectivity

If you are using an Autodesk 2014 or 2015 product, please apply this 

hotfix. If applying the hotfix does not resolve the issue, try these troubleshooting steps.

Windows OS:

Check the Internet Explorer connection settings

  1. Open Internet Explorer.
  2. Click Tools > Options.
  3. Access the Connections tab.
  4. Click LAN Settings. They should look like this:

  1. Click OK.
  2. Launch the product and test to make sure you can establish an Internet connection.

Check the Internet Explorer Advance settings 
* This solution applies after installing poodle hot fix or if you are running 2016

  1. Open Internet Explorer.
  2. Click Tools > Options.
  3. Access the Advanced tab.
  4. Scroll down and check ‘Use SSL 3.0’


  1. Click OK.
  2. Launch the product and test to make sure you can establish an Internet connection.

Additional Troubleshooting 
If you still can’t establish a connection, try the following:

  • Shut down and try to log in to Windows again.
  • Check that the machine time settings reflect the correct local time.
  • Check whether you are behind a proxy. It could be blocking the connection.
  • Check that antivirus software or firewall settings are not blocking Internet connectivity.
  • Rename the following Windows folder, appending a 2 to the folder name as:

Old name: C:\User\<username>\AppData\Roaming\Autodesk\ADUT\  
New name: C:\User\<username>\AppData\Roaming\Autodesk\ADUT2\

  • If you have administrator privileges, right-click the product icon (Revit, AutoCAD, and so on) and select Run as Administrator. Then close the program and reopen it normally.

Desktop Subscription FAQ

To learn more about Desktop Subscription, see the frequently asked questions below:


Q. What is desktop Subscription ?


Ans. Desktop Subscription is a purchasing option that allows you to license Autodesk desktop software on a term basis to meet a variety of business needs and budget considerations, such as project-based work, or hiring temporary staff. Customers who purchase Desktop Subscription receive benefits such as access to the latest software and product enhancements, Basic Support, and in some cases, access to select cloud services.


Q. What Desktop subscription plans are available for purchase ?


Ans. For a list of available Desktop Subscription plans, contact Absolut Info Systems or visit www.aisplstore.com


Q. What are the key features/benefits of Desktop Subscription Licenses ?


Desktop Subscription grants license holders the right to use desktop software for a specified period of time with the option to renew their contract for additional payments.

Customers who purchase a Desktop Subscription receive benefits such as access to the latest software and product enhancements, Basic Support, licensing rights such as Previous Version, Global Use, and Home Use Rights, and depending on the suite or product, access to select cloud services. The following table provides a summary of the key features and benefits.

Feature / Benefit Desktop Subscription
Key benefits
  • Access to the latest Autodesk software, updates and previous versions
  • Expanded access and installation rights Access to select cloud services
  • Technical support & exclusive subscriber communications
Term lengths Monthly, quarterly, annual, and multiyear terms available
License model

Named User term-based licenses, where a named user is an individual and may not be shared with any other individual.

Global Use Rights Use outside of the country of purchase when purchased in home country. If purchased outside home country, can only be used in the country of purchase.
Home Use Rights The Administrator or Named User can install software on multiple computers to be accessed by a Named User.
Previous Version Rights Desktop Subscription Eligible Previous Versions.
Cloud Services
  • Access to select cloud services based on offering purchased
Cloud Storage
  • 25GB with an active Subscription
  • Storage is reduced to 5GB upon expiration. You have 30 days after contract expiration to download data.
Cloud Credits Purchasable in 100 packs for use at the contract level
Access to new software releases and enhancements Yes, subscribers receive notifications and have the option to download new releases and/or product enhancements.
Support Basic Support included for most products and suites. Advanced Support and Enterprise Priority Support are available based on product level and/or company size.


Q. What are the benefits of Autodesk Desktop Subcription ?



  • Pay-as-you-go access to desktop software: This gives you the flexibility to control costs without a large up-front investment. In some cases, you may be able to bill the cost of Desktop Subscription back to your clients, making it easier to treat software costs as an operating expense rather than a capital expense.
  • Stay up to date: With an active Desktop Subscription, you always have access to the latest software releases and product enhancements.

  • Licensing Rights: Desktop Subscription includes Previous Version Rights which allow you to use previous versions of your software (be sure to check the Previous Version Eligible Product List for available products and versions). Desktop Subscription also includes Home Use and Global Use Rights; install and use your software on alternate machines and/or use your software outside of your home country. See Autodesk Subscription Terms and Conditions for details.

  • Flexible licensing: Desktop Subscription enables you to easily scale up the number of licenses to manage temporary increases in workload or staffing, and scale back when you no longer need them. 

  • Support: Never go at a problem alone, Basic and Advanced Support (for select products) are available to help you troubleshoot common issues. You will also receive exclusive subscriber-only newsletters and communications as well as access to webinars and other e-learning tools.


Q. What is the difference between monthly,quartely, annual, and multi-year Desktop Subcription Licenses ?



  Monthly Quarterly Annual Multiyear
Term length 1 month 3 months 12 months

24 or 36 months

Available for purchase through:        
Autodesk Reseller   x x x
Renewable   x x x


Q. What are the support benefits of Desktop Subscription ?


Ans. Desktop Subscription includes access to Basic Support, or Advanced Support depending on the product or suite edition. Autodesk technical support ensures you have a quick and effective way to troubleshoot problems as they occur. Desktop Subscription customers also have access to exclusive newsletters and communications and e-learning to help you take full advantage of your Desktop Subscription benefits.