Logstash lost connectivity to ElasticSearch

My logstash server has been working fine for weeks. No-one has touched it. All of a sudden, it has lost connectivity to ElasticSearch.

The log is filled with "Marking url as dead. Last error: [LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError] Elasticsearch Unreachable: "

However, issuing a curl command (e.g. to list all indices) from the same machine, with the same user, works fine.

How can I debug this?

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