Usually, for security reasons, the Firewall will be there, and if it is disallowing the communication.Sometimes a server may be running but not listening on port because of some overridden settings etc.Usually ports like 8080, (for tomcat), 3000 or 4200 (for react/angular), 3306(MySQL), 27017(MongoDB) or occupied by some other agents or totally down i.e. If it is not present, it will throw an exception on the client-side. As client and server involved, both should be in a network like LAN or internet.First, let us see the possible reasons for the occurrence of : Connection refused. We need to handle the exception carefully in order to fulfill the communication problem. : Connection refused: connect is the most frequent kind of occurring networking exception in Java whenever the software is in client-server architecture and trying to make a TCP connection from the client to the server.
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