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发生java.net.ConnectException: Connection refused: connect什么原因？

我的ServerSocket启动后，客户端同时启动100个以上线程去请求它时，中途经常会有 java.net.ConnectException: Connection refused: connect at java.net.PlainSocketImpl.socketConnect(Native Method) at ...
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用mail.jar爬取邮件时报错Connection timed out: connect

at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:321) at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:237) at com.sun.mail.iap ...