Set the value to your (or the hostname of your license server).
Aspen licensing typically relies on UDP/TCP ports (Sentinel RMS) or custom ports specified during SLM setup. Test if the port is open by running a PowerShell command: powershell Test-NetConnection -ComputerName [Server_Name] -Port 5093 Use code with caution.
Type ping server_name (replace server_name with your actual license server IP or hostname). Press Enter. Aspen Hysys License Checkout Failed
Sometimes, security software blocks the ports required for license communication (typically ports 5093 or 5099). Ensure that the AspenTech SLM executable and the specific ports used by the Sentinel RMS or SLM are whitelisted in your Windows Firewall. Restart the License Service
Sometimes, licenses are "leaked"—meaning they were checked out but never released back to the pool. The Workaround: Perform an and flush the Process Data REST cache Set the value to your (or the hostname
If HYSYS cannot "see" your server name, you can force it to look in the right place by adding a system environment variable. Right-click My Computer and select Properties Advanced system settings Environment Variables System variables Variable name: (some versions may require Variable value:
Check if packets receive replies. Request timeouts indicate a network connection failure. Type ping server_name (replace server_name with your actual
Sometimes Hysys opens fine, but throwing the error happens only when opening a specific file. This occurs because the simulation file uses specialized extensions—such as Hysys Dynamics , Sulsim , or Upstream options—that your company’s license package does not include. Try opening a completely blank Hysys case.