Connect() Method Ignoring Its Timeout Value

I'm developing an application for Android that requires sending messages over a TCP socket connection. I have set a timeout value as per the connect(SocketAddress endpoint, int tim

Solution 1:

The connect timeout is for the case where the you get no response from the remote server. In other cases the timeout doesn't apply; e.g.

• when the connection succeeds,
• when the remote server refuses the connection,
• when the networking layer says "no route to host"
• when the networking layer says "no route to network" / "network unreachable".

In these cases, the connect attempt succeeds or fails immediately. If you want to keep trying, you need to wrap the connect call in some code that will retry in the event of a retryable failure. (And it is up to you to write the code to decide how often to retry, and when to stop, so as not to waste network resources, battery charge, etc.)

Solution 2:

That is the intended behavior of the method. Timeout is only relevant when establishing connection takes time. If it is determined that the connection cannot be established due to other reasons, error will be thrown immediately, without wasting time. That's how the method is implemented internally.