Postgresql – pg_hba.conf entry for host "<ip address>", user "<db user>", database "postgres", no encryption, how to fix this?

I am trying to connect to my postgres db hosted on AWS RDS. But somehow I am getting the below mentioned error.
pg_hba.conf entry for host "103.215.537.148", user "dbmasteruser", database "postgres", no encryption

I am using postgres 15.2

I have tried checking on internet but I am not sure how to change the pg_hba.conf file on aws rds.

I tried connecting the db to ec2 and setting the inbound rules but nothing works.

Thanks for the help.

    import WebSocket from 'ws';
    import PGPubsub from 'pg-pubsub';
    import { db } from '../../config';

    const initializeWebSocket = async (server: any) => {
      const wss = new WebSocket.Server({ server });

      const connectionString =
        process.env.NODE_ENV === 'development'
          ? db.dev.DB_URL
          : db.production.DB_URL;
      console.log('_____', process.env.NODE_ENV, '______ws');

      const pgClient = new PGPubsub(
        'postgres://dbmasteruser:[email protected]:5432/postgres',
        { log: console.log },
      );


      const channel = 'users_insert';

      await pgClient.addChannel(channel, function (channelPayload) {
    
        console.log(channelPayload, 'channnel run is ther some insersion');
        wss.clients.forEach((client) => {
          if (client.readyState === WebSocket.OPEN) {
            client.send('Data in the database has changed');
          }
        });
      });

      const matchChannel = 'match_update';
      await pgClient.addChannel(matchChannel, function (channelPayload) {
        wss.clients.forEach((client) => {
          if (client.readyState === WebSocket.OPEN) {
            client.send('Data in the database has changed');
          }
        });
      });
      const res = await pgClient.publish(channel, { hello: 'world' });
  
    export default initializeWebSocket;

    import Logger from './core/Logger';
    import { port } from './config';
    import app from './app';
    import http from 'http';
    import WebSocket from './routes/webSocket/webSocketServer';
    console.log('hii server');

    const server = http.createServer(app);

    WebSocket(server);

    server
      .listen(port, () => {
        Logger.info(`server running on port : ${port}`);
      })
      .on('error', (e) => Logger.error(e));