Oracle ORA-24408: could not generate unique server group name PHP on Ubuntu

I am trying to setup a PHP (Ubuntu) server to connect to an Oracle database.  Installed oci8 PHP extension by following these directions:

https://help.ubuntu.com/community/PHPOracle

When I try to make my connection with oci_connect, I get:

ORA-24408: could not generate unique server group name

This article suggests downgrading to 10g, but I'd like to get it working with the latest client if possible:

http://nickshontz.wordpress.com/2011/11/29/php-oracle/

Comments suggest it might be related to a hostname problem--but I'm not clear from comments how to address the issue.  Any help much appreciated.
scotruAsked:
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slightwv (䄆 Netminder) Commented:
I'm only responding to a neglected question alert.  I'm not a PHP or Ubuntu person but have a lot of Unix in a previous life.

Check for a loopback.  Look at the following link in the section:  Loopback Interface

https://help.ubuntu.com/10.04/serverguide/C/network-configuration.html

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scotruAuthor Commented:
Definitely on the right track.  I had to add a hosts entry for the server's host name in the /etc/hosts file for the loopback address.

127.0.0.1    server-hostname

This fixed the problem.  I'm not clear on the difference between 127.0.0.1 and 127.0.1.1 (maybe this should be the later, but it works with the 0.0.1).
slightwv (䄆 Netminder) Commented:
127.0.0.1 is the universal loopback address.  technically anything with 127. is also considered 'local'.
scotruAuthor Commented:
Ah, I see-- yea, I'm familiar with 127.0.0.1, just didn't realize the whole class A was local.  

Thanks!
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