You can identify the problem by following these steps:
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Check if the cluster status is RUNNING. You cannot connect to the cluster if the cluster is being created, deleted, or when its IP whitelist is being updated.
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Check if the IP address of your connection is included in the IP white list.
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Test the connectivity of the port by running telnet in01-(uuid).(region).vectordb.zillizcloud.com 19530. If the issue remains unsolved after all above steps are tried, please submit a request.