Maintenance of the ANSYS Software License Server @ LRZ :

Update from 9th March 2021:

The ANSYS software release 2021.R1 is now installed on LRZ Linux Clusters, RVS and SuperMUC-NG. The new version 2021.R1 has been made the new default version in the LRZ module system. Modules of older ANSYS releases (19.x) have been deprecated and removed from the HPC systems.

In case that you encouter any remaining issues with the newly provided ANSYS software modules, please file a LRZ Service Request.

Update from 2nd March 2021 (at 4:00 pm):

  • The license server update has successfully been completed for both ANSYS license servers at LRZ:
    • - for ANSYS research licenses
    • - for ANSYS teaching licenses
  • The license servers are again open for normal user operation.
  • If you encounter any remaining issues with ANSYS licensing, please:
    1. Read the document below.
    2. Read the updated ANSYS HPC documentation.
    3. Adjust the license server settings in your local ANSYS software installation to your needs.
    4. Some users report (for rather old ANSYS Releases 19.x), that they had to delete the formerly used license server name, save, and then to open the Client ANSLIC_ADMIN Utility with local Administrator rights a 2nd time to re-enter the license server name again, also the license server name for the ANSYS Research licenses have not changed.
    5. It seems, that ANSYS releases prior to 18.x are no longer supported by the ANSYS license server software. In that case please update the ANSYS software to a newer and contemporary release (e.g. 2021.R1).
    6. Reset the user license preference settings for your local ANSYS software installation.
    7. ICEM/CFD and ANSYS Mechanical (APDL; outside ANSYS Workbench)
      • It seems, that under certain circumstances the ICEM/CFD and ANSYS Mechanical (APDL) environment is caching the list of license feature increments yet in another place in the users local environment.
      • If the above mentioned reset of the user license preference settings has already successfiully been done, and nevertheless the ICEM/CFD meshing or the APDL solver tries to check-out the old license feature increment aa_r or aa_t_a, than the following needs to be done by the ANSYS user:
      • Open a Windows explorer / file manager
      • Go to the following path in the local users environment:
             C:\Benutzer\< of your windows user account...>\AppData\Roaming\Ansys
      • Here you need to rename the subdirectory in accordance with your used ANSYS version, e.g.:
             v201  -->  v201_save
      • Retry to run your ICEM/CFD meshing or your APDL solver. The corresponding version subdirectory should get automatically recreated and the ICEM/CFD meshing or APDL solver should now access the correct license feature increment, i.e. "ansys" instead of "aa_r" or "aa_t_a". 
    8. ANSYS Electronics Products (AEDT, Maxwell-2d/3d, HFSS,...):
      • Open the ANSYS Electronics Desktop (AEDT)
      • Open the Options Menue
      • Under the item "Options --> General --> Desktop Configuration" please set the check mark for
             "Use Electronics Pro, Premium, Enterprise product licensing"
      • This option activates the new 2021.R1 license feature increments for the ANSYS electronic products.
    9. If the issue still exists, please file a LRZ Service Request.
  • With the update of the ANSYS license servers at LRZ from now on the newest ANSYS software release 2021.R1 is supported as well, so that you can update your local software installation to this new release now.
  • On LRZ Linux Cluster CoolMUC-2 (SLES15) the new ANSYS release 2021.R1 is now available. Old software modules 19.x have been removed from the system as no longer supported.
  • On the other Linux Cluster systems (CoolMUC-3, IvyMUC), the RVS and SuperMUC-NG the new software modules for the ANSYS software will be provided after the maintenance of the cluster software environment on upcoming 4th March 2021 in due course.


Update from 1st March 2021:

  • The newly introduced license server for the management of ANSYS teaching licenses has already been installed:
  • This teaching license server is ready for testing.
  • In order to use this new teaching license server users need to do the following:
    • Open the "Client ANSLIC_ADMIN Utility" with Windows Administrator priviledges
    • Enter the name of the teaching license server under the license server settings.
      Until the update of the main ANSYS license server ( by tomorrow (2nd March 2021), only one license server can be listed under the license server settings at the same time.
    • Reset user-specific license preference settings (for each individual installed ANSYS version)

In case of any question please submit a LRZ Service Request.


Original Announcement from 23rd February 2021:

Dear Users of the ANSYS Software @ LRZ, 

due to quite substantial changes to the academic licensing scheme of the ANSYS software, being introduced by ANSYS Inc. with the latest software release ANSYS 2021.R1 in Jaunary 2021, the administrators of the LRZ license server for the ANSYS software have to implement these changes in a hereby announced maintenance.

      Maintenance of the ANSYS Software License Server @ LRZ
      Affected Service:
      Start : Tuesday, 02. March 2021 at 8am

      End:    Tuesday, 02. March 2021, at 4pm

Possible Consequences and Side Effects of the Announced Maintenance:

  • During the maintenance period the functionality of the ANSYS software license server cannot be guaranteed.
    A reboot of the license server can be necessary during the maintenance window at any time. Thereby still running simulations with the ANSYS software might loose the connection to the license server and terminate due to lack of software licenses. Local work with the ANSYS software will be affected as well.
  • Which systems are affected by the maintenance of the license server
    •  SuperMUC-NG
    • All Linux Clusters at LRZ including housed cluster systems
    • LRZ Login nodes and RVS system
    • All computer systems at TUM, LMU, HM which receive their ANSYS software licenses through the above named LRZ license server service (
      This affects the work with both the ANSYS Research and Teaching licenses throughout the whole Munich Scientific Network (MWN) including computer systems being connected to MWN via VPN.
  • Which ANSYS software versions are affected?
    All ANSYS software versions will be affected by that change to the ANSYS 2021.R1 software licensing scheme being introduced here by ANSYS Inc. The corresponding changes in the licensing scheme will be documented on the LRZ documentation pages:
    In particular FEM and CFD solver licensing will be limited to the solver execution on 4 build-in CPU cores (formerly on up to 16 build-in cores). For each additional core in the FEM/CFD solver execution an ANSYS HPC license will be required. Further changes affect the mesh size/element number restrictions of the ANSYS teaching licenses.

The LRZ licensing team is working towards the goal to keep the maintenance window as short as possible and will announce in due course, if the restart of productive work with the ANSYS software will be possible again after finalizing the maintenance. This might occure well before the published end of the maintenance window, if all intended update work to the ANSYS 2021.R1 release can be finalized earlier.

Split of ANSYS Research and Teaching Licenses:

Due to the changes in the licensing scheme the LRZ will split the provisioning of ANSYS software licenses depending on license type on two different LRZ license servers:

  • - provisioning of ANSYS research licenses
  • - provisioning of ANSYS teaching licenses
The change will take effect after the license server maintenance on Tuesday, 02. March 2021, 4pm.
Users intending to use the ANSYS teaching licenses need to refer to the local ANSYS software installation, invoke the Client ANSLIC_ADMIN Utility (or in Release 2021.R1: ANSYS Client Licensing Settings) and they need to enter here the corresponding license server name for the intended ANSYS license type.

Required User Action after the Completed Maintenance:

In order to refer to the newly renamed ANSYS software license feature increments, all users of the ANSYS Software need to reset their local license preference settings for the used ANSYS software release(s) and for each individual ANSYS software user. This can be done by opening for each locally installed and used ANSYS software release the Client ANSLIC_ADMIN Utility and do:

  • Open the Client ANSLIC_ADMIN Utility
    • Enter the corresponding license server name (licansys.lrz de  vs.
      The port numbers to be entered here remain unchanged (Ports 2325 and 1055).
      This step requires to run the Client ANSLIC_ADMIN Utility with Windows Administrator priviledges.
  • Open the Client ANSLIC_ADMIN Utility
    • License preference settings for the local user
      • Select the appropriate ANSYS Software Release from the provided list --> Ok button
        • Press the button on the bottom of the window to "Reset Settings to Default"
      • This step has to be repeated for all locally installed and used ANSYS software versions.

In case of any arising question, please file a LRZ Service Request.

Verfasser: Th. Frank
veröffentlicht: 2021-02-22