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AppDynamics customers and established members should click the sign in button to authenticate.
If you are interested in disabling this because it just gets in the way, here's one way.
For Chrome - install Stylish add-on.
Open your browser and navigate to your Controller URL. Click on the "S" icon at the upper right to launch the Stylish add-on interface and click "Create New Style"
Give it the style a name and click "Save".