[Beowulf] unable to contact node grid1

[Alejandro Hurtado Turiño]

Hi,
i'm have problem with with my cluster, no jobs run ok. 
The pbs server log say at start up: 
10/31/2005 13:54:28;0006;PBS_Server;Svr;PBS_Server;Using ports Server:
15001  Scheduler:15004  MOM:15002
10/31/2005 13:54:28;0002;PBS_Server;Svr;PBS_Server;Server Ready, pid = 
2317
10/31/2005 13:54:28;0004;PBS_Server;Svr;WARNING;!!! unable to contact node 
grid1 !!!
10/31/2005 13:54:28;0001;PBS_Server;Svr;PBS_Server;Connection refused 
(111) in contact_sched, Could not contact Scheduler - port 15004
---
grid1 is the pbs server with pbsmon installed.
no firewall
my mom-priv/config
$clienthost    grid1
$logevent      255
$restricted    grid1
$usecp         *:/data /data
---
Looking for it in the web, i see the problem is common but notbody answer 
it.
could anybody helpme please!??
thanks 
ale