was 连接问题

Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:413)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:274)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:261)
at java.net.Socket.connect(Socket.java:556)
at java.net.Socket.connect(Socket.java:504)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:403)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:521)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:618)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1140)
at com.primeton.access.client.impl.transport.HttpToolKit.callCommonService(HttpToolKit.java:154)
... 110 more
是连接池不够用？还是端口被占用了？ 谁遇过类似的问题？