java.net.ConnectException: the system lacked sufficient buffer space or because a queue was full

Question

I am trying to check the connectivity by pinging various IPs by the following code.

ipAdd = InetAddress.getByName(ipAddress);
            boolean isConnected = ipAdd.isReachable(3000);

But I get this error.

java.net.ConnectException: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full

The reson being there are around 1000 threads doing this process simultaneously. I have thought about keeping these IPs in a queue. But for that I want to know the maximum number of Threads I can use. Is there any way to find out the buffer space so that I can figure out the number of threads to be triggered simultaneously that will run the above code. I would appreciate any other work around/solution apart from the queueing method.

Answer 1

I guess this exception occurs because you have exceeded the limit of ports that can be used by your application.
do you close your connections?