Autodesk Establish an Internet Connection to Continue

Subscription Licensing Error:

When you try to start the program, the following error is displayed: Establish an Internet connection to continue

The Autodesk license server cannot be found. This problem can be caused by a variety of issues, including:

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

Causes:

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

Solution:

If you are using an Autodesk 2014 or 2015 product, please apply the POODLE Hotfix.
If applying the Hotfix does not resolve the issue, try the troubleshooting steps below:

Check the Internet Explorer connection settings

  1. Open Internet Explorer.
  2. Click Tools > Options.
  3. Access the Connections tab.
  4. Click LAN Settings.
  5. Click OK.
  6. Launch the product and test to make sure you can establish an Internet connection.

Check the Internet Explorer Advanced settings
* This solution applies after installing poodle hotfix 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'
  5. Click OK.
  6. 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.
  • Delete the following Windows files and folders:
    • Go toC:\ProgramData\Autodesk\and delete theADUTfolder
    • Go toC:\Users\<user>\AppData\Roaming\Autodesk\and delete theADUTfolder
    • Delete the 3 files that begin with theadskflexinC:\ProgramData\FLEXnet. (NoteFiles could be hidden)
    • Delete the fileLoginState.xml in%LOCALAPPDATA%\Autodesk\Web Services
  • 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.

Use Telnet to confirm the port is open

Use Telnet to confirm that the port is open in Windows. For details, see the Screencast Telnet for Desktop Subscription.

  1. Install the Windows Telnet Client.
    • Open a Command prompt window. Click Start, typecmdin the Start Search box, and press Enter.
    • Type the following command:pkgmgr /iu:"TelnetClient"
    • If the User Account Control dialog box appears, click Yes to accept.
    • Click Continue.
    • When the Command prompt appears again, the installation is complete. Close the Command prompt.
  2. Open a new Command prompt and run the following command:telnet cur.autodesk.com 443

If it doesn't work, you may need to close and reopen the Command prompt several times to enable Telnet.

If there is no error, the connection is established. You should see a blinking cursor.


Network Connectivity Blocked by a Proxy Server (or Firewall)

Allow anonymous pass-through at the Proxy level by white-listing the domains on the article below (both HTTP and HTTPS):

  • What URLs / protocols should be accessible for Desktop Subscription to work?

If you cannot allow pass-through at the Proxy level, please white-list the above links on Gateway. Then instruct the user to bypass the proxy as follows:

  1. Open Internet Explorer.
  2. Click Tools > Options.
  3. Go to the Connections tab.
  4. Click LAN Settings.
  5. Click Advanced (under the Proxy Server area of the page)
  6. Add the domains on the article above into the Exceptions text box:

If you are under proxy WPAD follow the steps on the article below:

  • How to enable automatic proxy detection (WPAD) for Windows

In some cases could it be helpful to remove Trovi, WAJAM, or DNS Unlocker

Trovi (Search Protect) prevents desktop subscribers from accessing their products. Uninstall it following these instructions: Error: "The application was unable to start correctly (0xc0000142)"

WAJAM software enforces proxy server settings on the Internet Explorer browser. Unless you remove this software, you can't disable the proxy server settings and connect to the Autodesk license server. Follow these instructions to uninstall WAJAM: Removal instructions for Wajam

DNS Unlocker prevents the oxygen login screen by taking control of your proxy server settings located in the LAN settings.
http://botcrawl.com/dns-unlocker-virus-removal/

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