When using a three-server redundancy setup for hosting the license manager, license handling does not work correctly if the designated Primary server goes down.
To work around this, make sure that the license manager is using the latest version of the License Manager binaries distributed with COMSOL Multiphysics. They can be found here.
For COMSOL Multiphysics version 5.4, this should be enough to solve the issue.
For versions 5.3a and 5.3, the COMSOL installation also needs to be patched. Please contact COMSOL support for further instruction if you need to patch installation of COMSOL Multiphysics 5.3a and 5.3.
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