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A server can only register a single TCP port.<br />
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Use Sysinternals TCPView (<a href="http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx" rel="ugc">http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx</a>) for more infos.
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A server can only register a single TCP port.

Use Sysinternals TCPView (http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx [http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx]) for more infos.

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On a windows 7 platform with cygwin, I try to launch activemq which, in my case, use port 61619.<br />
From time to time, an exception is thrown : <br />

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Caused by: java.io.IOException: Failed to bind to server socket: tcp://127.0.0.1:61619 due to: java.net.BindException: Address already in use: JVM_Bind<br />

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When this exception is thrown, I use netstat -ao: there is no process listening to port 61619.<br />
<br />
If I change my activemq conf in order to use another port (for instance 64000), it works fine.<br />
<br />
Is it possible to have this exception even if netstat -ao doesn't list any process listening to this port? <br />
<br />
Is it possible that a process reserves a range of ports, and if true, how to know which process and what range?
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On a windows 7 platform with cygwin, I try to launch activemq which, in my case, use port 61619.
From time to time, an exception is thrown : 
Caused by: java.io.IOException: Failed to bind to server socket: tcp://127.0.0.1:61619 due to: java.net.BindException: Address already in use: JVM_Bind

When this exception is thrown, I use netstat -ao: there is no process listening to port 61619.

If I change my activemq conf in order to use another port (for instance 64000), it works fine.

Is it possible to have this exception even if netstat -ao doesn't list any process listening to this port? 

Is it possible that a process reserves a range of ports, and if true, how to know which process and what range?

Windows 7 Address already in use: JVM_Bind

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.