"Received the following HTTP error code from the server:504"
This means the Jira server you have set up in the application link is not responding to the query. Go to admin -> application links and check the link is correct. If it is, then check that Jira is currently running on that url, and then that your Confluence has a route across your network over to the Jira.
We get same error if we use this JQL: status was not in (Closed) before "2019-01-01"
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