I have reviewed the other (archived) Thread dealing with probably the same issue.
And what "other thread" would that be?
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Not to pile on, but of course any "archived" discussion would be irrelevant in light of the recent 19.2.1 patch release debut.
So if yours is actually the same problem, installing 19.2.1 should resolve it. Otherwise, on 19.2, follow the recommendations to disable the Code Insight feature in the Code Editor preferences.
latest version fixes the connectivity problem :-)
Thanks Oracle !