Local or network firewalls block the specific ports used by the Sentinel RMS License Manager (typically UDP port 5093).
: Temporarily disable your antivirus and firewall software, then attempt to launch Aspen HYSYS [22†L6-L7]. If the error disappears, you'll need to add Aspen HYSYS and its license components to your security software's exclusion list:
Understanding the underlying causes of this error allows simulation engineers and IT administrators to resolve the issue quickly and restore system functionality. Common Causes of the Error
and set its value to your computer name or the server's IP address [2]. Restart License Services Navigate to the Aspen installation directory and locate the Sentinel RMS License Manager Within the folder, find WlmAdmin.exe Rename the file to WlmAdmin.exe.old , then right-click and Run as administrator Check Token Availability Aspen Hysys License Checkout Failed
When the error window finally disappears and HYSYS loads your simulation, you won't just have fixed a license—you'll have mastered the art of AspenTech licensing troubleshooting. Now, go converge that column.
If HYSYS cannot find the server, you may need to manually point the software to your computer's name using an environment variable. Get Computer Name: Right-click Properties and copy your Device name Open Environment Variables: Search Windows for "Edit the system environment variables." Create 'LS_HOST': System Variables Variable Name: Variable Value: [Your Computer Name] Save and Restart: Click OK on all windows and restart HYSYS. 📂 Step 3: Refresh SLM Admin Tools Sometimes the WlmAdmin.exe tool used for managing licenses becomes unresponsive. Navigate to Directory:
The system environment variables on the host machine point to an outdated server name or the wrong port number. Local or network firewalls block the specific ports
The "Aspen Hysys License Checkout Failed" error is usually a communication or capacity issue rather than a software bug. By systematically checking your network, verifying SLM settings, and monitoring seat usage, you can quickly identify the bottleneck and get back to your simulation tasks. If the problem persists after these steps, contacting your internal IT department or AspenTech support with the specific error code is the best course of action.
Ensure the status is . If it is stopped, right-click and select Start . 3. Review Environment Variables
This approach is often the quickest fix, as many users have reported that simply disabling their antivirus resolved the license checkout error [4†L5-L10]. Common Causes of the Error and set its
If the vendor daemon is down: Restart the FLEXnet service.
Use a triad server configuration to prevent single-point-of-failure downtimes.
Navigate to C:\ProgramData\SafeNet Sentinel\ or the corresponding AspenTech SLM cache folder.