Run this on the license server:
By following the steps in this guide—starting with the simple (restart service, reboot) and moving to the advanced (telnet tests, trust cache deletion, lmstat diagnostics)—you can diagnose the exact failure point within 15 minutes. Aspen Hysys License Checkout Failed
Environment Variables: Check your Windows System Environment Variables. Ensure that LSERVRC or LSFORCEHOST variables are not pointing to an old, non-existent server. Run this on the license server: By following
The AspenTech License Configuration tool is the bridge between your software and the license key. trust cache deletion