[jgroups-users] Chat doesn't work for specific user

Hi,

When I use org.jgroups.demos.Chat from jgroups-3.6.5.Final.jar on two hosts
then this works when the program is started by user a but not if it started
by user b (neither a or b are root). Only for user b I see an error message
like this:

> May 17, 2017 10:08:07 AM org.jgroups.protocols.TP$BaseBundler
sendSingleMessage
SEVERE: JGRP000029: <host_x>-51650: failed sending message to
<host_y>-53536 (114 bytes): java.io.IOException: errno: 1 (Operation not
permitted), error: sendto failed (local port 58186 to address
<ip_of_host_x_restricted> (<host_x_restricted>), remote port 57239 to
address <ip_of_host_y_restricted> (<host_y_restricted>)), headers: PING:
[type=GET_MBRS_RSP], UDP: [cluster_name=ChatCluster]

I am not an admin on these hosts but I know that these host have multiple
network interfaces and on one interface there are user specific
restrictions for user b implemented with AppArmour. I do understand that I
see such errors when user b does specific network communication on the
restricted interface but why is the channel not build over the other
working interfaces? Can I configure JGroups to ignore such errors and
continue with the other interfaces?

When I use MCastReceiver/Sender test everything works with both users.

When I force JGroups to bind to a specific address also everything works
with both users. But I would like not to be forced to do this configuration
because I don't know in advance the correct interface/address. These are
machines in a cloud and I don't have much influence on which hosts my apps
are deployed and how they are configured regarding the network. But I can
specify system properties to be set for my apps.

I use JGroups 3.6.5. because I am bound to a Java 7 environment.

Ciao
  Chris

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