title: Cygwin Serial Port permission denied error
body: <p>I have installed Cygwin in Windows 7. I am trying to access serial port from Cygwin via /dev/ttyS0 interface. But everytime I access, it gives permission denied error.<br>
      '$ stty raw &lt; /dev/ttyS0'<br>
      -bash: /dev/ttyS0: Permission denied    </p>
  
  <p>When I check the permission of this device:<br>
      '$ ls -l /dev/ttyS0'<br>
      'crw-rw-rw- 1 user1 Domain Users 117, 0 Nov  3 14:31 /dev/ttyS0'    </p>
  
  <p>This shows that I have rights. Also, I have read somewhere that ttyS0 is COM1 of Windows.
  I have also checked with administrator rights explicitly with Runas and with 'cygstart --action=runas command'.
  I have googled it but did'nt find right direction.</p>
  
  <p>Thanks in advance</p>