A host denying server role

From: hiwa (HGA03630_at_nifty.ne.jp)
Date: 06/22/05 

Date: 21 Jun 2005 17:24:04 -0700

On our plain vanilla LAN, one of the hosts can't be connected
as a server. The host in question, however, can do client access
to other hosts on the LAN.

In our simple plain vanilla Java client/server program, when
the server is run on the host in question, client program
throws a NoRouteToHostException which usually means
existence of a firewall or router-down. But these two problem
doesn't exist on our LAN.

Ping command works normally for both directions, i.e. from
other hosts to the problem host, and vice versa.

What could be the causes and solutions for such problem
in which a specific host can't be accessed as a server?

We use Fedora Core 3 on every hosts but installation on the
machine in question was done by some outside people whom
we can't reach now. SELINUX=disabled on every host on the LAN.

Thanks in advance and best regards,

FYR: Other server running on the host in question also can't
be accessed as a server. Here is nfs access from other host:

mount to NFS server '192.168.11.6' failed: server is down.

This 192.168.11.6 is the host that is neglecting server role.
NFS server daemon is certainly running on that host, though.

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