Error in connection with PostgreSQL

Only today, I can't visualize the data in Looker Studio. I'm using PostgreSQL, and it indicates:

It was not possible to connect Looker Studio to your dataset.

The connection to the database could not be made. Check your connection parameters.

Unable to connect to database: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

 

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