Suddenly kibana crashed! Unable to connect to Elasticsearch


My elastic stack has been working fine but suddenly i got this error while accessing to kibana! it seems there is no connection to my elastic search and it is checking the localhost. but why? any idea?

Is ES running?

ye it was running but i don't know what was the problem, we restart the services in kibana and elastricsearch and problem solved but don't know why it happened!

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