Hi,
Can you please reconfigure the Logoff URL in the config tool:
Follow the steps below:
1. Run the Config Tool.
2. Click Cluster data, Global server configuration, services, com.sap.security.core.ume.service.
3. Set the value of the ume.logoff.redirect.url key to the URL of the LogOff page that you want to use for the Enterprise Portal.
4. Restart the WebAS J2EE engine.
Regards,
Anurag