Mutiple machine setup failure & Publish script modificat

In the Sample Build 1.1 'ZuluSampleData' database, the script 'Publish Calendar' there is a notation for "Multiple Machine Server Deployment" and how to adjust the script, stating 'edit the line below'. This notation is above the addition of the _host element to the $url, but does not properly reference the 'webPublishEngineHost' variable setting above it.
As a result of this, making the modification where the specified still results in the url attempting to go to the regular DB server, rather than the web publishing engine.
Although I've found a couple information pieces looking through the website (regarding multiple machine setup) I'm still having trouble and want to confirm what's expected. I have installed the plugin in the web publishing plugins on the publishing machine. I can access the http://<...>:8040/zulu on that machine. I have modified the script to point the 'webPublishEngineHost' variable to this machine (so that it alters both the hostname and the _host entry) and still get the following error:
An error occurred while communicating with your FileMaker database. Please verify that the database is on, and web publishing is enabled.
So at current (<> are placeholders, not literal addresses):
* http://<www.db>:8040/zulu -- Successful, still shows time remaining in the demo phase
* IWP access through <www.db> to database -- Successful
* DB access thorugh <db> -- Successful
* Publish script going to http://<www.db>:8040[...]_host=<www.db> -- Error
Is my url and plugin setup correct? Is there any other step for multiple machine I haven't been able to fully uncover?
As a result of this, making the modification where the specified still results in the url attempting to go to the regular DB server, rather than the web publishing engine.
Although I've found a couple information pieces looking through the website (regarding multiple machine setup) I'm still having trouble and want to confirm what's expected. I have installed the plugin in the web publishing plugins on the publishing machine. I can access the http://<...>:8040/zulu on that machine. I have modified the script to point the 'webPublishEngineHost' variable to this machine (so that it alters both the hostname and the _host entry) and still get the following error:
An error occurred while communicating with your FileMaker database. Please verify that the database is on, and web publishing is enabled.
So at current (<> are placeholders, not literal addresses):
* http://<www.db>:8040/zulu -- Successful, still shows time remaining in the demo phase
* IWP access through <www.db> to database -- Successful
* DB access thorugh <db> -- Successful
* Publish script going to http://<www.db>:8040[...]_host=<www.db> -- Error
Is my url and plugin setup correct? Is there any other step for multiple machine I haven't been able to fully uncover?