Workflow: RaiseException failed with a 401.1 authentication error


Even with valid credentials, calling WorkflowGen from the WorkflowGen server fails with a 401.1 error.

To reproduce

  1. Open a web browser from a local session on the WorkflowGen server.

  2. Enter the URL with the hostname to open the WorkflowGen Portal (e.g.

  3. Enter the wfgen_admin login and password.

  4. You receive a 401.1 error.


  1. Choose Run from the Windows menu, then enter regedit and click OK.

  2. In the Registry Editor, locate the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa registry key.

  3. Right-click Lsa and choose New, then click DWORD Value.

  4. Enter DisableLoopbackCheck in the Value name field, then press ENTER.

  5. Right-click DisableLoopbackCheck and choose Modify.

  6. In the Value field, enter 1, then click OK.

  7. Close the Registry Editor. You might need to restart your server.