I’ve had the issue several times on Oracle BPEL Worklist app where the details of the task is not displayed with the error ‘Server not found’.
The the reason for this seems to be that the page is trying to resolve a internal load balancer address, and not the external facing client side load balancer that the browser can access. To fix this, do the following steps:
Go to the BPEL process of the specific composite in Enterprise Manager. Then click on the Human task under the Component Metrics tab.
You’ll then see the internal address and port that cannot be resolved from your web browser.
Replace these with the external address as well as port. (Most probably the one used when accessing the Worklist app url) Click “Apply”
Your Worklist app should now load.
Credit: Thanks to my colleague Ben Taljaard for helping to solve this issue.