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    Check if ip adress is correct, if the port is correct, and if the server is up and running and waiting for connections. Also, check if there's no firewall blocking you and if your internet connection is working.

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Solutions on the web

via Coderanch by Jawed Nazar Ali, 1 year ago
Could not connect to SMTP host: mail.sdfpak.org, port: 25; nested exception is: java.net.ConnectException: Connection refused
via Coderanch by ravi v kumar, 1 year ago
Could not connect to SMTP host: 10.45.26.62, port: 25; nested exception is: java.net.SocketException: Software caused connection abort: connect
via Coderanch by Mannu Pal, 1 year ago
Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1
via Google Groups by Damian Marinaccio, 10 months ago
Unknown SMTP host: smtp.niper.ac.in; nested exception is: java.net.UnknownHostException: smtp.niper.ac.in
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