DataPower Gateway firmware level v10.6.0.0 that comes with the CP4I v16.1.0.1 has removed the old DataPower WebGUI and uses the new GUI. Initial firmware version might cause that users can not login to the new web GUI.
A new firmware level / ifix must be applied. Since the DP fw v10.6.0.1 is so new, it requires to do an override to pull the new firmware image and load it.
The document guides through the DataPower Gateway OCP image override - Override of DataPower Gateway OCP firmware image to resolve GUI login issues
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Tomaž Paternoster
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