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                          INFO - What happens when you lose connection to an Ansys FlexNet License server?

                          Authored by Steve Barnett September 20th, 2024 5486 views 2 likes KB1752187

                          Description

                          When using an Ansys FlextNet License Server Opening and running Ansys client software requires you maintain consistent connectivity with the license server (unless the license is borrowed). This article will explain how this connectivity works and what happens when connectivity is lost.

                          Solution

                          Behavior Reliability

                          All testing in this article was performed using Ansys 2022 R2.  We have historically seen no noteworthy changes to this behavior across versions, however, future versions may behave differently.

                          This behavior may vary slightly depending on your environment and due to slight variance observed in heartbeat intervals in our testing.

                           

                           

                          Every ~5min-10mins, the client software checks-in with the server.  This is called the heartbeat. When it can't contact the license server, the following process occurs:

                          1. The user receives an error message that the License server is lost. 
                          2. The client tries to connect every ~5-10min for up to 60min, displaying an error message every ~5-10min of this countdown. 
                          3. The software continues to operate as normal for up to 60min, after which point the application will Timeout and depending on the application and behave as described in the table below.
                            1. If connection is restored after Timeout occurs, while the software is still in read-only mode, it will resume full functionality and notify the user that read-only mode has been disabled.  Solving is also impacted by a Timeout, see the table below for examples.
                          4. By default, after the License Disconnect Timeout period, if the license server does not receive any communication from the client, it will check back in all licenses that are checked out to the client, so they are available to other users.
                            1. If this does not occur, due to a software glitch, it's referred to as a stuck license bug.  For more info, see HOW TO - Release a Stuck License. 

                           

                          Applications What happens after Time out Occurs (~60min) What happens after Connection is restored and first heartbeat occurs (takes ~5-10min)?
                          Mechanical
                          • Application goes into read-only mode
                          • Active simulations pause
                          • Application resumes normal operation 
                          Mechanical ADPL
                          • Active simulations terminate
                          • Application closes
                          • N/A because application is closed
                          Fluent
                          • Application goes into read-only mode
                          • Active simulations pause
                          • Application resumes normal operation
                          • Any paused simulations will resume automatically
                          Electronics
                          • Application remains useable
                          • Active simulations pause
                          • Any paused simulations will resume automatically
                          Discovery
                          • Application goes into read-only mode without warning/notification
                          • When saving you are notified that it's in read only mode
                          • Active simulations pause but appear like they are still running.  The estimated simulation time will not progress.
                          • Application resumes normal operation
                          • Any paused simulations will resume automatically
                          SpaceClaim
                          • Applicaiton closes without saving, however if the “backup every” option in the settings menu is checked, autosaves occur every 10 minutes (default, can be set to 1-100 minutes) 
                          • N/A because application is closed

                           

                           

                           


                           

                          timout

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