XManager unable to connect to Red Hat Linux [1]

I keep getting the following errors while trying to connect to Red Hat Enterprise Linux 3.

Already configured according to FAQs on netsarang website but still unable to make X display work for RHEL, xterm works perfectly thou.

Note:
- I am able to connect to Solaris via both xterm and xdisplay successfully.
- All firewall ports to my PC are opened up for the testing.
- the solaris / linux machines belong to the same VLAN

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Waiting for client connections ...
XdmcpFill: too few bytes(-1) received
Xdmcp: Timed out, state 3. Retransmissions: 0
Xdmcp Query Address: 10.138.219.26
XdmcpFill: too few bytes(-1) received
Xdmcp: Timed out, state 3. Retransmissions: 1
Xdmcp Query Address: 10.138.219.26
XdmcpFill: too few bytes(-1) received
Xdmcp: Timed out, state 3. Retransmissions: 2
Xdmcp Query Address: 10.138.219.26
XdmcpFill: too few bytes(-1) received
Xdmcp: Timed out, state 3. Retransmissions: 3
XDM go to sleep: too many retransmissions
User forces server termination.
Terminate at server reset is active.
Exiting the waiting loop ...
X server was terminated normally.
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You should check the following:

1. On the Redhat machine, allow UDP 177 port.

2. Check if gdm process is running and run it if it's not.

Perhaps the following page might help you setting up your server. Refer to Step 3, the Start up guide.

/download/down_xme2.html