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Following is the summary of the OSS Note 1031159 to enable the anonymous access for Webdynpro Java Iviews

1. Make sure that the Web Dynpro application runs without login when you navigate to this application as a standalone application (not via the portal).
2. From the Portal Catalog, open the iView/Page property editor and set the property 'Authentication Scheme' to 'anonymous' - perform this step to all Web Dynpro iViews/pages that you are planning to run with anonymous user.
3. Add the page/iView to a portal role.
4. Assign the role to the 'Anonymous Users' group.
5. Navigate to the permission editor: 'System Administration' -> 'Permissions' -> 'Portal Permissions'.
6. Browse to the folder: 'Security Zones' -> 'sap.com' -> 'NetWeaver.Portal' -> 'low_safety'.
7. Open the component 'com.sap.portal.appintegrator.sap' -> 'WebDynproPageBuilder'.
8. Assign the 'Anonymous Users' group with Read and End User rights.
9. Perform Step 8 for the following components as well:
a) com.sap.portal.dsm -> Terminator
b) com.sap.portal.epcf.loader -> WdScriptBlockProvider

Reference: OSS Note 1031159