Gradle ant ftp error: "425 Connection timeout"

Question

I have a problem with my gradle script construction:

apply plugin: 'java'

/*
 * Sources:
 * http://stackoverflow.com/q/17201815/4490015
 * https://github.com/Vazkii/Botania/blob/master/build.gradle
 */

repositories {
    mavenCentral()
}

configurations {
    ftpAntTask
}

/*
 * Load configuration file.
 */
ext.priv = parseConfig(file('private.properties'))

/*
 * Some project properties
 */
version = '0.0.1'
group = 'randers.notenoughvocab'
archivesBaseName = 'NotEnoughVocab'

dependencies {
    ftpAntTask('org.apache.ant:ant-commons-net:1.8.4') {
        module('commons-net:commons-net:1.4.1') {
            dependencies 'oro:oro:2.0.8:jar'
        }
    }
}

void ftp(Map args, Closure antFileset = {}) {
    ant {
        taskdef(name: 'ftp',
                classname: 'org.apache.tools.ant.taskdefs.optional.net.FTP',
                classpath: configurations.ftpAntTask.asPath)
        Map ftpArgs = args + [ //some default options
                               verbose : 'yes',
                               server  : priv.host,
                               userid  : priv.user,
                               password: priv.pass
        ]
        delegate.ftp(ftpArgs) {
            antFileset.delegate = delegate
            antFileset()
        }
    }
}

def parseConfig(File config) {
    config.withReader {
        def prop = new Properties()
        prop.load(it)
        return (new ConfigSlurper().parse(prop))
    }
}

/**
 * Uploads the javadoc to the server specified in private.properties
 */
task('uploadJavadoc', dependsOn: 'javadoc') << {
    ftp(action: 'send') {
        fileset(dir: 'build/docs/javadoc')
    }
}

jar {
    manifest {
        attributes 'Main-Class': 'randers.notenoughvocab.main.NotEnoughVocab'
    }
}

task('prepareBuild') {
    ant.replace(file: 'src/main/java/randers/notenoughvocab/main/Reference.java', token: '@VERSION@', value: version)
}

build.dependsOn(tasks.prepareBuild)

The following error message appears:

could not install file: 425 Could not open data connection to port 55080: connection timeout

It seems to work for others . The server specified in private.propertiesworks fine with an FTP client, for example FileZilla, I do not quit the game. I also tried the same with a local FTP server, but since the transport has no bandwidth limitations, the transport was instant.
What can I do to prevent a timeout? And is there a port 55080I have to worry about?

, , priv.host, priv.user priv.pass .

Answer 1

, , , NAT IP-, FTP- . Ant passive: 'yes' ftpArgs.

FTP - : , , IP-. " "