Why is the assessment I open blank when I access it through open.dll?

Users opening an assessment from open.dll are taken to a blank page when they select a link to start an assessment. This error occurs due to settings on the web server that does not allow the redirect to session.dll command to be sent correctly to the browser, in most cases this can be corrected by changing the way that Perception Server handles the redirection forcing it to be done in a specific way.

Changing Redirection Method for Perception Server

To change the redirection method used by Perception Server it is necessary to change the server settings, to make these changes:

1. In Enterprise Manager select Administration | Server Management

2. Select Server Settings

3. Find the Redirection method settings

4. By default Perception is setup to use a combination of HTML page with META refresh tag and HSE_REQ_SEND_URL_REDIRECT_RESP to ensure compatibility with a wide range of operating environments to redirect pages, but this can sometimes cause confusion for the browsers. To correct the problem select the option required, in most cases forcing the Perception Server to pass the refresh information on to the browser in the form of HTML page with META refresh tag only, is the most effective.

5. Once changes have been made, you will need to save them, to do this select Save & Exit from the menu on the left hand side

6. With the changes made you will need to reset the server DLLs to make the changes effective, to do this see Resetting Server DLLs

Resetting Server DLLs

In order to reset the DLLs of the Perception Server so that any changes to the server settings are realised you will need to carry out the following:

1. In Enterprise Manager select Administration | Server Management

2. Click Reset Perception Server DLLs

3. Select the DLLs you wish to reset, in this case it is recommended you reset all of them, and click Reset

4. Follow the on screen prompts as each of the DLLs reset and initialise, by clicking the Click here when the 'DLL Initialized' message is displayed button.

5. Once they are all reset the Close this window button will appear.

The settings have now been changed and made available to the Server.