FlexNet Licensing error:-15, 10. Systems error: 10061 "WinSock: connection refused" - FlexNet Licensing error:-15, 10. Systems error: 10061 "WinSock: connection refused" Description You might see this error message after modifying an Intel® Quartus® Prime Software license file and not using a plain text editor. Applications that are not plain text editors will automatically insert special characters which the service cannot read. Resolution To avoid this error, use any plain text editor , like Vim*, gVim*, Notepad*, or Notepad++*. Custom Fields values: ['novalue'] Troubleshooting 00759917 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software'] No plan to fix No plan to fix ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']