xfree crashes out

["ROSS, Colin" <rossc at parliament dot uk>]

On NT4wks SP6 with Cygwin 
I run startxwin.bat: things start to happen, an X window appears briefly,
then bombs out.
I get this error msg-


C:\root\usr\X11R6\bin>XIO:  fatal IO error 104(Connection reset by peer) on
X server "127.0.0.1:0.0"
after 0 requests (0 known processed) with 0 events remaining.

I ran startx from within Cygwin shell, here is the error msg-

_XSERVTransmkdir: Owner of /tmp/.X11-unix should be set to root
winDetectSupportedEngines () - Windows NT/2000
winDetectSupportedEngines () - DirectDraw installed
winDetectSupportedEngines () - Allowing PrimaryDD
winDetectSupportedEngines () - Returning, supported engines 0000001b
winSetEngine () - Using Shadow DirectDraw
winAdjustVideoModeShadowDD () - Using Windows display depth of 32 bits per
pixel

winCreateBoundingWindowWindowed () - WindowClient width 640 height 480
winInitVisualsShadowDD () - Masks 00ff0000 0000ff00 000000ff BPRGB 8 d 32
      0 [main] X 221 open_stackdumpfile: Dumping stack trace to
XWin.exe.stackdump
giving up.xinit:  Connection refused (errno 111):  unable to connect to X
server xinit:  No such process (errno 3):  Server error.

I looked in the mailing list for help. 
Do not know what to try to fix this. Anyone seen this kind of error before?

Colin