Not getting login using xdmcp

[Andrew DeFaria <ADeFaria@Salira.com>]

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Now that Christmas is over I'd like to address this problem again. Let's 
recap.

I have a SuSE 8.2 installation. I am attempting to use Cygwin/XFree86 to 
start an X session using XDMCP. XDMCP is not on by default so I have 
performed the following changes:

    * Enabled XDMCP in /opt/kde3/share/config/kdm/kdmrc by setting
      "Enable=true" for the [Xdmcp] section.
    * Modified /etc/X11/xdm/xdm-config to comment out
      DisplayManager.requestPort by putting a "!" in the first character.
    * Uncommented the "*" line in /etc/X11/xdm/Xaccess and
      /opt/kde3/share/config/kdm/Xaccess. Note there are two different
      lines in each file. The difference seems to be one is of the form
      of "* CHOOSER BROADCAST" and just the plain "*". I've tried all
      combinations to no avail.
    * I have only one NIC.
    * I've tried xwin -query sonslinux -from adefaria, same problem.
    * Sonslinux sits right next to me and I can login using KDE just
      fine on the console - I just can't get a remote X session from my
      XP box to put up a chooser.
    * XWin.log always seems to indicate "XDM: too many retransmissions"
      as the problem (Sample XWin.log attached). Note that XDM: too many
      retransmissions only shows up after waiting for a while.
    * Nothing listed in /var/log/messages nor /var/log/kdm.log on sonslinux.

In all cases, after making a configuration change I restart kdm.

Help!
-- 
11th commandment - Covet not thy neighbor's Pentium.

[-- Attachment #2: XWin.log --]
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ddxProcessArgument - Initializing default screens
winInitializeDefaultScreens - w 1600 h 1200
winInitializeDefaultScreens - Returning
OsVendorInit - Creating bogus screen 0
_XSERVTransmkdir: Owner of /tmp/.X11-unix should be set to root
(EE) Unable to locate/open config file
InitOutput - Error reading config file
winDetectSupportedEngines - Windows NT/2000/XP
winDetectSupportedEngines - DirectDraw installed
winDetectSupportedEngines - Allowing PrimaryDD
winDetectSupportedEngines - DirectDraw4 installed
winDetectSupportedEngines - Returning, supported engines 0000001f
InitOutput - g_iNumScreens: 1 iMaxConsecutiveScreen: 1
winSetEngine - Using Shadow DirectDraw NonLocking
winAdjustVideoModeShadowDDNL - Using Windows display depth of 32 bits per pixel
winCreateBoundingWindowWindowed - User w: 1600 h: 1200
winCreateBoundingWindowWindowed - Current w: 1600 h: 1200
winAdjustForAutoHide - Original WorkArea: 0 0 1126 1600
winAdjustForAutoHide - Adjusted WorkArea: 0 0 1126 1600
winCreateBoundingWindowWindowed - WindowClient w 1594 h 1095 r 1594 l 0 b 1095 t 0
winCreateBoundingWindowWindowed -  Returning
winCreatePrimarySurfaceShadowDDNL - Creating primary surface
winCreatePrimarySurfaceShadowDDNL - Created primary surface
winCreatePrimarySurfaceShadowDDNL - Attached clipper to primary surface
winAllocateFBShadowDDNL - lPitch: 6376
winAllocateFBShadowDDNL - Created shadow pitch: 6376
winAllocateFBShadowDDNL - Created shadow stride: 1594
winFinishScreenInitFB - Masks: 00ff0000 0000ff00 000000ff
winInitVisualsShadowDDNL - Masks 00ff0000 0000ff00 000000ff BPRGB 8 d 24 bpp 32
winCreateDefColormap - Deferring to fbCreateDefColormap ()
winFinishScreenInitFB - returning
winScreenInit - returning
InitOutput - Returning.
MIT-SHM extension disabled due to lack of kernel support
XFree86-Bigfont extension local-client optimization disabled due to lack of shared memory support in the kernel
(--) Setting autorepeat to delay=500, rate=31
(--) winConfigKeyboard - Layout: "00000409" (00000409) 
(EE) No primary keyboard configured
(==) Using compiletime defaults for keyboard
Rules = "xfree86" Model = "pc101" Layout = "us" Variant = "(null)" Options = "(null)"
Could not init font path element /usr/X11R6/lib/X11/fonts/Speedo/, removing from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/Type1/, removing from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/100dpi/, removing from list!
winPointerWarpCursor - Discarding first warp: 797 547
winBlockHandler - Releasing pmServerStarted
winBlockHandler - pthread_mutex_unlock () returned
winDeinitClipboard - Noting shutdown in progress
winDeinitMultiWindowWM - Noting shutdown in progress
winDeinitClipboard - Noting shutdown in progress
winDeinitMultiWindowWM - Noting shutdown in progress