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When using java.net.Socket.connect(), both a refused connection and a timeout result in a ConnectException.
java.net.ConnectException: Connection timed out: connect
java.net.ConnectException: Connection refused: connect
How can I safely distinguish between the two? Sure parsing the error message does the job. But when the message changes in a future Java release, I'm out of luck.
The bigger picture: I'm writing a web service client using JAX-WS with a Metro implementation. When a web service call fails, I want to report the reason for the failure clearly so the issue can be resolved quickly.
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In general, connection refused errors are generated during a connect system call when an application attempts to connect using TCP to a server port which is not open.
The connection timeout is the timeout in making the initial connection; i.e. completing the TCP connection handshake. The read timeout is the timeout on waiting to read data1.
request timeout — a time period required to process an HTTP call: from sending a request to receiving a response. connection timeout — a time period in which a client should establish a connection with a server.
A server connection timeout means that a server is taking too long to reply to a data request made from another device. Timeouts are not a reply message: they show up when there isn't a reply and a server request is not fulfilled in a predetermined length of time.
Measure the time passed between invoking connect() and the exception was thrown, and pass that information on.
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