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Intermittent IE8 Problems On Custom Login Page: "The User-Agent "null" is unknown" (Doc ID 2025865.1)

Last updated on JULY 09, 2020

Applies to:

Oracle WebCenter Portal - Version to [Release 11g]
Information in this document applies to any platform.


In an WebCenter Installation, an error is intermittently seen when using a WebCenter Portal Framework application in an IE8 browser.

A custom login page does not have the right layout and formatting.
and the following warning is seen in the logs

<May 21, 2015 11:56:51 AM AST> <Warning> <org.apache.myfaces.trinidadinternal.agent.AgentFactoryImpl> <BEA-000000> <The User-Agent "null" is unknown; creating an agent with "unknown" agent attributes.>



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