ReportBuilder & FQDN

Anyone run into this?

ReportBuilder fails to load when using a FQDN (fully qualified domain name) URL.
ie: http://servername.xyz.company.com/Reports/Pages/Folder.aspx

ReportBuilder loads with no issue when using the shortname URL.
ie: http://servername/Reports/Pages/Folder.aspx

details:

ERROR SUMMARY
Below is a summary of the errors, details of these errors are listed later in the log.
* Activation of http://servername.xyz.company.com/ReportServer/ReportBuilder/ReportBuilder.application resulted in exception. Following failure messages were detected:
+ Downloading http://servername.xyz.company.com/ReportServer/ReportBuilder/ReportBuilder.application did not succeed.
+ The remote server returned an error: (403) Forbidden.

COMPONENT STORE TRANSACTION FAILURE SUMMARY
No transaction error was detected.

WARNINGS
There were no warnings during this operation.

Nevermind Figured it out -

Modify RSWebApplication.config for Hard IP.

<ReportServerUrl>http://<Site IP Address>/ReportServer</ReportServerURL>

<ReportServerVirtualDirectory></ReportServerVirtualDirectory>

Works - just recycle the application pools in IIS. By the way if you are configuring the manager for a non-default IP address be carefull. For some reason the report manager does not like a <ReportServerVirtualDirectory> value if <ReportServerURL> is supplied.