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Hi, months later, I found the solution in another forum. We have to change the “ip filtering” enketo configuration, the file is in ~/kobo-env/enketo_express/config.json.

Notice that when the server is in a private datacenter, usually the public IP is not directly associated with the machine, so thats why we have to change the allowPrivateIPAddress property to true.

 "ip filtering": {
        "allowIPAddressList": [],
        "allowMetaIPAddress": false,
        "allowPrivateIPAddress": true,
        "denyAddressList": []
    },
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