[jira] Commented: (FTPSERVER-292) Starting two servers on the same port should fail

["Francis De Brabandere (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FTPSERVER-292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700120#action_12700120 ] 

Francis De Brabandere commented on FTPSERVER-292:
-------------------------------------------------

temporary solution: add this code just before starting up your server

	/**
	 * Throws an exception if we can connect to the port.
	 * There is a problem on windows that makes two servers can be started on the same port:
	 * http://www.mail-archive.com/ftpserver-users@mina.apache.org/msg00749.html
	 * @throws FtpException
	 */
	private void checkForOtherServer(final int port) throws FtpException{
		Socket sock = null;
		try {
			sock = new Socket();
			sock.bind(null);
			sock.connect(new InetSocketAddress("localhost", port), 200);
			throw new FtpException("An other server is running on port "+port);
		} catch (UnknownHostException e) {
			throw new FtpException(e.getMessage(), e);
		} catch (IOException e) {
			logger.debug("No other server running.");
		} finally {
			if(sock != null){
				try {
					sock.close();
				} catch (IOException e) {
					logger.warn("Could not close test socket");
				}
			}
		}
	}


> Starting two servers on the same port should fail
> -------------------------------------------------
>
>                 Key: FTPSERVER-292
>                 URL: https://issues.apache.org/jira/browse/FTPSERVER-292
>             Project: FtpServer
>          Issue Type: Improvement
>         Environment: windows xp
>            Reporter: Francis De Brabandere
>
> see this thread:
> http://www.mail-archive.com/ftpserver-users@mina.apache.org/msg00749.html
> I start up a ftp server in my unit tests. But I want to make sure
> there is only one instance running on a port, starting a second server
> on the same port should fail (throw an exception).
> Right now the second server starts up without errors but making a
> connection to the port used gives me the first server...
> =quote=
> Windows has a weird (or wrong)
> treatment of SO_REUSEADDR. You can read more about it here:
> http://msdn.microsoft.com/en-us/library/ms740621(VS.85).aspx
> This has been discussed here before, but with no good resolution. One
> possibility is that we could make our use of SO_REUSEADDR
> configurable.

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