This is my first go around with Elgg so bear with me.

Installed elgg 1.12.4 on ubuntu 14.04 as per http://learn.elgg.org/en/1.x/intro/install.html#a-note-on-settings-php-and-htaccess

Installed in /var/www/html

When I use the local machine to view the web pages they render fine. When I use another PC to view them 
(using the IP Address) the HTML renders fine but none of the images (favicons load) and none of the js loads.
The ip address goes from the ip address of the server to localhost/<whatever>

When I look at the chrome debugger it shows the various js and images not loading. An example is elgg and it shows as status failed.
I look in the index file and it appears to be showing links to the localhost such as:
<link rel="stylesheet" href="http://localhost/cache/1443147034/default/css/elgg"&gt;
This is the same as the js files.

The URL shows the address as localhost/../.. instead of IP address when I drill down past the main page

So it appears that my problem lies with somebody, probably apache or this rewrite?, using localhost for followup requests instead of using the IP address of the server.

Here are some of the files that may have the issues:

/var/www/html/.htaccess:

# Elgg htaccess directives

<FilesMatch "(nginx|htaccess).dist">
    order allow,deny
    deny from all
</FilesMatch>

# Don't allow listing directories
Options -Indexes

# Follow symbolic links
Options +FollowSymLinks

# Default handler
DirectoryIndex index.php

############################
# BROWSER CACHING

# Make sure .ico has proper MIME type, allowing mod_expires to handle them.
<IfModule mod_mime.c>
    AddType image/vnd.microsoft.icon .ico
</IfModule>

# The expires module controls the Expires and Cache-Control headers. Elgg sets
# these for dynamically generated files so this is just for static files.
<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresDefault "access plus 1 year"
</IfModule>

# Conditional requests are controlled through Last-Modified and ETag headers.
# Elgg sets these on dynamically generated cacheable files so this is just for
# static files. Note: Apache sends Last-Modified by default on static files so
# I don't think we need to be sending ETag for these files.
<FilesMatch "\.(jpg|jpeg|gif|png|mp3|flv|mov|avi|3pg|html|htm|swf|js|css|ico)$">
    FileETag MTime Size
</FilesMatch>

############################
# PHP SETTINGS
<IfModule mod_php5.c>
    # limit the maximum memory consumed by the php script to 64 MB
    php_value memory_limit 64M
    # register_globals is deprecated as of PHP 5.3.0 - disable it for security reasons.
    php_value register_globals 0
    # post_max_size is the maximum size of ALL the data that is POST'ed to php at a time (8 MB)
    php_value post_max_size 8388608
    # upload_max_filesize is the maximum size of a single uploaded file (5 MB)
    php_value upload_max_filesize 5242880
    # on development servers, set to 1 to display errors. Set to 0 on production servers.
    php_value display_errors 0
</IfModule>

############################
# COMPRESSION

# Turn on mod_gzip if available
<IfModule mod_gzip.c>
    mod_gzip_on yes
    mod_gzip_dechunk yes
    mod_gzip_keep_workfiles No
    mod_gzip_minimum_file_size 1000
    mod_gzip_maximum_file_size 1000000
    mod_gzip_maximum_inmem_size 1000000
    mod_gzip_item_include mime ^text/.*
    mod_gzip_item_include mime ^application/javascript$
    mod_gzip_item_include mime ^application/x-javascript$
    # Exclude old browsers and images since IE has trouble with this
    mod_gzip_item_exclude reqheader "User-Agent: .*Mozilla/4\..*\["
    mod_gzip_item_exclude mime ^image/.*
</IfModule>

## Apache2 deflate support if available
##
## Important note: mod_headers is required for correct functioning across proxies.
##
<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript application/javascript application/x-javascript image/svg+xml
    BrowserMatch ^Mozilla/4 gzip-only-text/html
    BrowserMatch ^Mozilla/4\.[0678] no-gzip
    BrowserMatch \bMSIE !no-gzip

<IfModule mod_headers.c>
    Header append Vary User-Agent env=!dont-vary
</IfModule>

    # The following is to disable compression for actions. The reason being is that these
    # may offer direct downloads which (since the initial request comes in as text/html and headers
    # get changed in the script) get double compressed and become unusable when downloaded by IE.
    SetEnvIfNoCase Request_URI action\/* no-gzip dont-vary
    SetEnvIfNoCase Request_URI actions\/* no-gzip dont-vary

</IfModule>

############################
# REWRITE RULES

<IfModule mod_rewrite.c>

RewriteEngine on

# If Elgg is in a subdirectory on your site, you might need to add a RewriteBase line
# containing the path from your site root to elgg's root. e.g. If your site is
# http://example.com/ and Elgg is in http://example.com/sites/elgg/, you might need
#
#RewriteBase /sites/elgg/
#
# here, only without the # in front.
#
# If you're not running Elgg in a subdirectory on your site, but still getting lots
# of 404 errors beyond the front page, you could instead try:
#
#RewriteBase /

# If your users receive the message "Sorry, logging in from a different domain is not permitted"
# you must make sure your login form is served from the same hostname as your site pages.
# See http://learn.elgg.org/en/stable/appendix/faqs/general.html#login-token-mismatch for more info.
#
# If you must add RewriteRules to change hostname, add them directly below (above all the others)

# hide all dot files/dirs (.git)
RewriteRule (^\.|/\.) - [F]

# cache handler to skip engine
RewriteRule ^cache\/(.*)$ engine/handlers/cache_handler.php?request=$1&%{QUERY_STRING} [L]

# deprecated export handler
RewriteRule ^export\/([A-Za-z]+)\/([0-9]+)\/?$ engine/handlers/export_handler.php?view=$1&guid=$2 [L]
RewriteRule ^export\/([A-Za-z]+)\/([0-9]+)\/([A-Za-z]+)\/([A-Za-z0-9\_]+)\/$ engine/handlers/export_handler.php?view=$1&guid=$2&type=$3&idname=$4 [L]

# rule for rewrite module test during install - can be removed after installation
RewriteRule ^rewrite.php$ install.php [L]

# Everything else that isn't a file gets routed through Elgg
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?__elgg_uri=$1 [QSA,L]

</IfModule>

/etc/apache2/sites-available/000-default.conf

ServerName elgg
<VirtualHost *:80>
    # The ServerName directive sets the request scheme, hostname and port that
    # the server uses to identify itself. This is used when creating
    # redirection URLs. In the context of virtual hosts, the ServerName
    # specifies what hostname must appear in the request's Host: header to
    # match this virtual host. For the default virtual host (this file) this
    # value is not decisive as it is used as a last resort host regardless.
    # However, you must set it for any further virtual host explicitly.
    #ServerName www.example.com

    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html

    # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
    # error, crit, alert, emerg.
    # It is also possible to configure the loglevel for particular
    # modules, e.g.
    #LogLevel info ssl:warn

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    # For most configuration files from conf-available/, which are
    # enabled or disabled at a global level, it is possible to
    # include a line for only one particular virtual host. For example the
    # following line enables the CGI configuration for this host only
    # after it has been globally disabled with "a2disconf".
    #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
<Directory "/var/www/html">
     AllowOverride All
     Options FollowSymLinks
</Directory>