Resolution:
Description:
===========
SYS_ERROR (multicast_error - (8) grp_iface not a valid multicast interface).

The following is the output from the console.

[root@tibcodev03 2.0]# java -jar lib/as-admin.jar
****************************************************************
TIBCO ActiveSpaces Administration Tool
Enterprise Edition. Version: 2.0.1.030 11-Jul-2012 SVN Rev.15792
Copyright(c) 2011-2012 TIBCO Software Inc. All rights reserved.
****************************************************************

Type for help commands help, 'quit' to exit

as-admin> connect
SYS_ERROR (multicast_error - (8) grp_iface not a valid multicast interface)
as-admin>

Environment:
===========
AS 2.*.*
All operating systems

Cause:
======
The interface is not listed in the /etc/hosts file, so PGM picks the first available interface in the file.

Resolution:
===========
The default value for the interface is the first available interface provided by the operating system hosts file for the machine. Note if the desired interface is not listed in the /etc/hosts file then PGM picks the first available interface in the file. (On most operating systems, this file is called the /etc/hosts file.) If the first interface is the loopback interface (127.0.0.1) then PGM fails to start. In this case, you would see a stacktrace exception in the log file resembling the following:

SYS_ERROR (multicast_error - (8) grp_iface not a valid multicast interface)

To resolve this issue, either modify the /etc/hosts file or provide the interface explicitly in the network argument.xIf. PGM discovery does not work on the 127.0.0.1 loopback or wireless networks.

More details about tibpgm and url format you can refer TIBCO  Activespaces Developer Guide.

Unable to connect: SYS_ERROR (multicast_error - (8) grp_iface not a valid multicast interface).

TIBCO  Activespaces Developer Guide.