Description of Problem:
I have enabled xdmcp, but I get:

XDMCP fatal error: Session declined Maximum number of open sessions from your
host reached

from my remote host.  But that host is freshly booted.

Version-Release number of selected component (if applicable):
gdm-2.4.0.7-14

[xdmcp]
# Distributions: Ship with this off.  It is never a safe thing to leave
# out on the net.  Alternatively you can set up /etc/hosts.allow and
# /etc/hosts.deny to only allow say local access.
Enable=true
HonorIndirect=true
MaxPending=4
MaxPendingIndirect=4
MaxSessions=16
MaxWait=15
MaxWaitIndirect=15
DisplaysPerHost=1
Port=177
# Willing script, none is shipped and by default we'll send
# hostname system id
Willing=/etc/X11/gdm/Xwilling

Other information:
This remote host has had trouble with NMI lockups, forcing me to hit the reset
switch.  So the connections aren't terminating nicely, but should still get
reset once the machine comes back up.  Perhaps gdm misses that.