E-PORTAL: "Could not open registry" Error with Single Link SSO from Portal to Content. (Doc ID 983986.1)

Symptoms

When Enterprise Portal uses a custom portal name and end user clicks on single link SSO to content, a new window opens and the following error occurs:

Could not open registry. Registry name:

In Enterprise Portal 9, create a CREF link (single link) to SSO into content.  By default Enterprise Portal uses the default Portal name EMPLOYEE.  Portal names are defined in "PeopleTools -> Portal -> Portal Definitions". 

Here's an example:
1.  In Portal, navigate to "PeopleTools -> Portal -> Structure and Contet".
2.  Click on "Add Content Reference"
3.  Update the following:

Name: MYTEST
Label: MYTEST
No Template = checked
Node Name: LOCAL_NODE
URL Type: PeopleSoft Generic URL
Portal URL: s/WEBLIB_EO_PE.PORTAL_HOMEPAGE.FieldFormula.IScript_Homepage_Nav?HP_NODENAME=HRMS&HP_TABNAME=DEFAULT

For "Content Reference Attributes", update the following:

Name: NAVNEWWIN
Attribute Value: true

The above assume that your nodes are setup correctly. 

Test case:

1.  Log into Enterprise Portal http://myportal.example.com/psp/myps/KPORTAL/KNODE/h/?tab=DEFAULT
2.  Click on MYTEST link
3.  New window appears with URL http://mycontent.example.com/psp/myhr/KPORTAL/HRMS/h/?tab=DEFAULT and the following error occurs:

Could not open registry. Registry name: KPORTAL

Cause

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