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You can test the AJAX proxy using the following URL: https://<connectionsYOUR_CONNECTIONS_url>URL/communities/ajaxProxy/https/YOUR_CE_URL/gadgets/communitystats.xml
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Check your custom.css file for issues. Also, check the widget-config.xml for issues related to itemset section. Use following URL to access your custom.css file: https://<connectionsYOUR_CONNECTIONS_url>URL/communities/ceWidgets/custom.css.
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