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https://issues.apache.org/jira/browse/NIFI-7997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17428434#comment-17428434
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Wiktor Kubicki commented on NIFI-7997:
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I think it can be connect with NIFI-6266
> ListFTP does not use HTTP proxy
> -------------------------------
>
> Key: NIFI-7997
> URL: https://issues.apache.org/jira/browse/NIFI-7997
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.11.4
> Reporter: Richard Zuidhof
> Priority: Major
>
> After configuring a HTTP type proxy server in the ListFTP processor Nifi
> still tries to connect directly to the FTP server instead of the proxy server
> for the initial connection. Subsequent commands like DIR or GET are tunneled
> through the HTTP proxy but without a direct connection to the FTP server this
> will never succeeded. There is no issue using a SOCKS proxy.
> You can reproduce this very easily, even without a real proxy. Just enter a
> non existing ftp host and set proxy type to HTTP and use a fake proxy host
> and port. When using a non-existing ftp hostname you will get this error.
> This shows Nifi wants to connect directly instead of via the proxy:
> {{2020-11-11 12:36:01,002 ERROR [Timer-Driven Process Thread-8]
> o.a.nifi.processors.standard.ListFTP
> ListFTP[id=99240cfd-0175-1000-ffff-ffffe04e112b] Failed to perform listing on
> remote host due to nowhere.to.go: java.net.UnknownHostException:
> nowhere.to.go}}
> When using an unreachable IP (like 10.123.1.1) you will see this:
> {{2020-11-11 12:43:10,862 ERROR [Timer-Driven Process Thread-10]
> o.a.nifi.processors.standard.ListFTP
> ListFTP[id=99240cfd-0175-1000-ffff-ffffe04e112b] Failed to perform listing on
> remote host due to Connection timed out (Connection timed out):
> java.net.ConnectException: Connection timed out (Connection timed out)
> java.net.ConnectException: Connection timed out (Connection timed out) at
> java.net.PlainSocketImpl.socketConnect(Native Method) at
> java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
> at
> java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
> at
> java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at
> java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at
> java.net.Socket.connect(Socket.java:607) at
> org.apache.commons.net.SocketClient._connect(SocketClient.java:243) at
> org.apache.commons.net.SocketClient.connect(SocketClient.java:181) at
> org.apache.nifi.processors.standard.util.FTPTransfer.getClient(FTPTransfer.java:600)
> at
> org.apache.nifi.processors.standard.util.FTPTransfer.getListing(FTPTransfer.java:233)
> at
> org.apache.nifi.processors.standard.util.FTPTransfer.getListing(FTPTransfer.java:196)
> at
> org.apache.nifi.processors.standard.ListFileTransfer.performListing(ListFileTransfer.java:106)
> at
> org.apache.nifi.processor.util.list.AbstractListProcessor.listByTrackingTimestamps(AbstractListProcessor.java:472)
> at
> org.apache.nifi.processor.util.list.AbstractListProcessor.onTrigger(AbstractListProcessor.java:414)
> at
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
> at
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1176)
> at
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:213)
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
> at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110) at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at
> java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)}}
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