client denied by server configuration

If using Apache as a proxy to the application server, and users are seeing the following

in their Browsers:

client denied by server configuration

In your httpd.conf, see if the following appears in the mod_proxy configuration:

<Directory />

     AllowOverride None

     Order Deny,Allow

     Deny from all

</Directory>

If so, then comment out (or remove) the 'Deny from all' directive, which

is causing very strict default access control for mod_proxy