Report Title:
Analysis and Resolution of "QCC License Check Failed" Error
Date: [Insert Date]
Report Author: [Your Name/Team]
System/Environment: QCC Audio Development Platform (e.g., QCC514x, QCC304x), MDE / ADK Toolkit
4. Check App Permissions
If the error is occurring with a specific app:
- Ensure the app has all the necessary permissions.
- Try uninstalling and reinstalling the app.
2. Common Causes
| Cause | Description |
|-------|-------------|
| Missing local license file | license.dat or *.lic not placed in the required directory |
| Invalid license key | Corrupted or incorrectly generated license |
| Expired license | Time-limited evaluation license has expired |
| Wrong license server address | Floating license cannot reach the server (port/hostname) |
| Environment variables not set | LM_LICENSE_FILE, ADK_LICENSE_FILE, or QCC_LICENSE_FILE missing or incorrect |
| Firewall / network blocking | License server port (e.g., 27000–27009) blocked |
| Host ID mismatch | License locked to a different MAC address or disk serial number |
| Multiple conflicting licenses | Old or invalid license files taking precedence |
Step 4: The Ping & Port Test
The license server might be visible to Windows Explorer but blocked by the software.
- Find your license server IP (e.g.,
192.168.1.50).
- In CMD:
ping 192.168.1.50 (Check connectivity).
- In CMD:
telnet 192.168.1.50 27000 (If you get a blank screen, the port is open. If "Connection refused," the firewall is blocking).
Windows 10/11
- The Service Host Fix: Go to Services.msc -> Properties on "FlexNet Licensing Service" -> Log On -> Check "Allow service to interact with desktop."
- Registry Clean: Delete
HKEY_LOCAL_MACHINE\SOFTWARE\FLEXlm License Manager old keys after uninstalling.
Step 1: The Basic Forensics (5 minutes)
- Restart your machine. This resets hung license daemons and clears temporary network routes.
- Check the clock. Synchronize with
time.windows.com or pool.ntp.org.
- Run as Administrator. Right-click the QCC tool -> "Run as administrator."
Common causes and fixes
Scenario B: The Generic Embedded Toolchain
If you are using a generic IDE and see "QCC license check failed," the vendor has likely branded their FlexNet feature as "QCC."
- Typical Fix: Check the license server dashboard. Run
lmstat -a to see if the "qcc" feature is actually checked out.
- Specific Issue: The vendor may have changed the feature name in an update. Run
lmutil lmstat -f qcc to see if the feature exists.
