Error in external interactive activity redirection from workspace

I'm not able to configure external interacitve activity in studio 6.0.
Here what's done:
-added activity, main task imlementation = external
-assigned prepare(), commit() methods
-added new server configuration
When launching workspace, the > sign on activity in inbox, throws:
"The task is external and it needs to be invoked through an API call and not through the Classic WorkSpace."
I should redirect to external server, as promised with studio help:
"Configuration: you can optionally define an URL. When the task is executed from WorkSpace, WorkSpace redirects the execution to the URL. "
The same happens if project is deployed to standalone 6.0
Any solution or exact instuction how to configure external activities for albpm 6.0?

I'm not able to configure external interacitve activity in studio 6.0.
Here what's done:
-added activity, main task imlementation = external
-assigned prepare(), commit() methods
-added new server configuration
When launching workspace, the > sign on activity in inbox, throws:
"The task is external and it needs to be invoked through an API call and not through the Classic WorkSpace."
I should redirect to external server, as promised with studio help:
"Configuration: you can optionally define an URL. When the task is executed from WorkSpace, WorkSpace redirects the execution to the URL. "
The same happens if project is deployed to standalone 6.0
Any solution or exact instuction how to configure external activities for albpm 6.0?

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    Can they talk to each other?
    Verify that SharePoint is using the correct IP address for the SQL server. To do this, run the ping command on the Windows SharePoint Services server.
    Verify that the SharePoint server is obtaining the correct IP address for the SQL server from DNS. To do this, run the
    nslookup command from the SharePoint Server.
    Make sure that there are no incorrect entries for the SQL server. To do this, examine the Hosts file on the SharePoint server. This file is in the following location:
    %systemroot%\system32\drivers\etc\Hosts
    On the SharePoint server, look for SQL client aliases. To do this, follow these steps: Click
    Start, click Run, and then type cliconfg in the
    open box.
    Click the Alias tab. By default, there are no SQL client aliases. If you have any aliases for the SQL server, verify that they are correct, or remove them.
    Open the SQL Server Configuration Manager (Start SQL Server 2008  Configuration Tools  SQL Server Configuration Manager
    Navigate to the SQL Server Network Configuration  Protocols for MSSQLSERVER node in the tree view
    Enable TCP/IP and Named Pipes (you’ll be warned that these changes will not apply until the service is shut down)

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