While configuring HPE StoreOnce Gen 4 Appliance if "Public Access" is disabled, the end-user will need to create a dedicated Catalyst Client so Backup Application can access the Catalyst Store
Steps Required:
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Navigate to Actions and select “Catalyst Settings”
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Once you are in "Catalyst Setting" navigate to permissions and press the “…” and select “Add Client”
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Provide a name that matches your need (i.e CV_Backup) -> enter this detail as you Username during Catalyst Store Creation
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Press Add and then you have successfully created a "Client" within HPE StoreOnce
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Important Note
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You will also need to navigate back to the Catalyst Store and set the “Access to enabled”
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Resolution
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Once the Catalyst Client is created, when creating the Catalyst Library from Commvault input the same Username and Password, at this point the Detection and creation should work