Once you fix the issue, take these preventive measures:
The activator cannot patch a file that is in use. If SLDWORKS.exe or any SOLIDWORKS background process (like the License Server) is active, the operating system returns an "invalid handle" error.
A: Not officially. SOLIDWORKS 2017 was tested only up to Windows 10 v1809. On Windows 11, activator handle errors (including Error 6) are much more common. Use Windows 10 or Windows 7 for best results. solidworks2017activatorssq error 6 fixed
If the licensing service itself is corrupt, the activator cannot get a valid handle.
Steps:
Error 6 occurs during the activation phase of SOLIDWORKS 2017 when the activator tool fails to communicate with the SOLIDWORKS licensing service or the Windows operating system's handle table.
| Cause | Explanation |
|-------|-------------|
| Interfering Antivirus | Real-time protection blocks the activator from modifying services or registry handles. |
| Corrupt License Cache | Previous failed activations leave stale license files in C:\ProgramData\FLEXnet. |
| Run Without Admin Rights | The activator needs SYSTEM-level access to stop/license services. |
| Windows Updates Conflict | Certain Windows 10/11 updates (KB500xxxx) tighten handle permission checks. |
| SSQ DLL Mismatch | Using an SSQ activator meant for a different SOLIDWORKS version or update (SP0 vs SP5). |
| Missing Visual C++ Runtimes | The activator requires specific Visual C++ Redistributable libraries. | Once you fix the issue, take these preventive measures:
Yes. The SSQ activator supports all service packs of SOLIDWORKS 2017. Error 6 is unrelated to the SP version.
Many users download generic or mismatched activators. Make sure you have: The activator cannot patch a file that is in use
| SOLIDWORKS 2017 Version | Compatible SSQ Activator | |------------------------|--------------------------| | SP0 – SP3 | SSQ 2017 Universal v1.2 | | SP4 – SP5 | SSQ 2017 Universal v2.0 | | Premium/Professional | Use the same as above (feature level is in the software, not activator) |
How to verify:
Check your SOLIDWORKS version: Help → About SOLIDWORKS → look for "SP X.X". Download the corresponding SSQ release from trusted archival sources (e.g., RuTracker, SolidSQUAD official backups). Verify the MD5 checksum if available.