Thursday, December 14, 2017

Auto CAD Subscription Licensing Error: "Establish an Internet connection to continue"

Issue:
When you start an Autodesk product for Windows, you see the following error message:
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:
There are many reasons for Internet connection problems. The solutions for the most common causes are listed below.
Solution:
Solution 1: For Autodesk 2014 and 2015 products, install the licensing security hotfix
1.      If you have a 2014 or 2015 product and haven’t applied the Autodesk POODLE hotfix, do so now.
2.      Follow the steps in Security Settings under Solution 2.

Solution 2: Check your browser settings LAN settings (required in all cases)

1.      Find the LAN settings in your browser.
·         In Chrome, go to Settings > Advanced > System > Open Proxy Settings > Connections > LAN Settings.
·         In Internet Explorer, go to Tools > Internet Options > Connections > LAN Settings.
Alternatively, select Internet Options in the Network control panel and click LAN settings in the Internet Properties dialog.
2.      Confirm that Automatically detect settings is not selected. The dialog should look like this:
  

Security settings (required if you've applied the POODLE hotfix in Solution 1 or have an Autodesk 2016 or later product.)
1.      In your browser settings, find the setting for SSL (Secure Sockets Layer) 3.0.
·         In Chrome, go to Settings > Advanced > System > Open proxy settings > Advanced > Settings > Security.
·         In Internet Explorer, go to Tools > Internet Options > Advanced > Settings > Security.
Alternatively, select Internet Options in the Network control panel and click the Advanced tab in the Internet Properties dialog.
2.      Scroll down to Use SSL 3.0 and confirm that it is selected.

Solution 3: Check your proxy server settings

If your network firewall allows Internet access only through a proxy server, change the settings on your browser to allow access to the Autodesk licensing server.
1.      Find the LAN settings in your browser.
·         In the Chrome menu, go to Settings > Advanced > System > Open Proxy Settings > Connections > LAN Settings.
·         In Internet Explorer, go to Tools > Internet Options > Connections > LAN Settings.
Alternatively, select Internet Options in the Network control panel and click LAN settings in the Internet Properties dialog.
2.      Under Proxy Server, make sure that Use A Proxy Server For Your LAN is selected
3.      Click Advanced.
4.      In the text box under Exceptions on the Proxy Settings dialog, enter these domain addresses.
Important: if your network uses WPAD (Web Proxy Automatic Discovery) to configure proxies, enable proxy detection.  Autodesk licensing components disable WPAD proxy detection because automatic detection can degrade performance in networks without proxy servers.

Solution 4: Uninstall any adware or malware on your computer

One or more of the following may be on your computer. You can search the Internet for ways to uninstall them.
·         If Trovi Search Protect is installed on your computer, uninstall Trovi. Trovi is a browser hijacker that you may have installed along with legitimate software.
·         If Wajam is installed on your computer, uninstall Wajam. Wajam is adware that displays social media posts in search results.
·         If DNS Unlocker is installed on your computer, uninstall DNS Unlocker. DNS Unlocker is malware that displays pop-up ads and advertising banners. 

Solution 5: Confirm that a required port on your computer is open

1.      Install Windows Telnet.
a.       Open a Command prompt window. (On Windows 10, right-click Start and select Command prompt.)
b.      Enter the following at the Command prompt:
·         pkgmgr /iu:"TelnetClient"
c.       If you see the User Account Control dialog, click Yes to accept.
d.      Click Continue.
e.       When the Command prompt appears again, the installation is complete.
2.      Run Telnet.
a.       Open a new Command prompt window.
b.      Type the following into the Command prompt window:
·          telnet cur.autodesk.com 443 
c.       If you connected successfully, you see a blinking cursor. If not, close the Command prompt window and try again. You may have to try several times.
d.      Contact your system administrator if you still can’t connect.

Solution 6: Try additional troubleshooting measures

If the previous solutions don’t solve your problem, try each of the following, one at a time. Test for success before trying the next one.
·         Shut down your computer and log in to Windows again.
·         Check that the local time setting is accurate on the Date and Time control panel.
·         Check with your system administrator to find out if any of the following are blocking your connection.
o    A proxy server
This article lists the supported proxy configurations for a single-user access license in a secured proxy environment.
·         Firewall security settings
·         Antivirus software
·         Go to the following locations and remove the specified files:
·         C:\Users\\AppData\Roaming\Autodesk—Delete the ADUT folder.
·         C:\ProgramData\FLEXnet—Delete the three files whose names begin with adskflex.
·         C:\Users\\AppData\Local\Autodesk\Web Services—Delete LoginState.xml.
Note: If you don’t see a file, it may be hidden. To make it visible, follow these instructions.
·         If you have administrator privileges on your computer:
·         Right-click the product icon and select Run As Administrator.
·         Close the program and reopen it normally.

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