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  1. ,
    Expert tip

    Check if you don't have a VPN running, as it might cause conflict and throw this exception.

java.net.SocketException: Socket closed	at java.net.PlainSocketImpl.socketAccept(Native Method)	at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409)	at java.net.ServerSocket.implAccept(ServerSocket.java:545)	at java.net.ServerSocket.accept(ServerSocket.java:513)	at org.simplejavamail.mailer.internal.socks.socks5server.AnonymousSocks5Server.run(AnonymousSocks5Server.java:72)	at java.lang.Thread.run(Thread.java:745)