I manage to successfully connect to FTP host with FTP connector (with username, password). However when I connect List Files / Folders node, it returns error:
“425 Unable to build data connection: TLS session of data connection not resumed”
My KNIME version: 5.3.2
FTP Connector settings: use FTPS enabled, port 9900, Reuse SSL session enabled, tried implicit FTPS enabled or disabled, tried hostname-verify enabled or disabled).
Log:
2025-04-29 09:45:53,470 : ERROR : KNIME-Worker-148-List Files/Folders 3:477 : : Node : List Files/Folders : 3:477 : Execute failed: 425 Unable to build data connection: TLS session of data connection not resumed.
java.io.IOException: 425 Unable to build data connection: TLS session of data connection not resumed.
at org.knime.ext.ftp.filehandling.fs.FtpClient.makeIOEFromResponse(FtpClient.java:377)
at org.knime.ext.ftp.filehandling.fs.FtpClient.checkPositiveResponse(FtpClient.java:343)
at org.knime.ext.ftp.filehandling.fs.FtpClient.checkPositiveResponse(FtpClient.java:338)
at org.knime.ext.ftp.filehandling.fs.FtpClient.listFiles(FtpClient.java:214)
at org.knime.ext.ftp.filehandling.fs.FtpFileSystemProvider.lambda$1(FtpFileSystemProvider.java:235)
at org.knime.ext.ftp.filehandling.fs.FtpFileSystemProvider.invokeWithResource(FtpFileSystemProvider.java:341)
at org.knime.ext.ftp.filehandling.fs.FtpFileSystemProvider.createPathIterator(FtpFileSystemProvider.java:235)
at org.knime.ext.ftp.filehandling.fs.FtpFileSystemProvider.createPathIterator(FtpFileSystemProvider.java:1)
at org.knime.filehandling.core.connections.base.BaseFileSystemProvider.newDirectoryStream(BaseFileSystemProvider.java:562)
at java.base/java.nio.file.Files.newDirectoryStream(Unknown Source)
at java.base/java.nio.file.FileTreeWalker.visit(Unknown Source)
at java.base/java.nio.file.FileTreeWalker.walk(Unknown Source)
at java.base/java.nio.file.Files.walkFileTree(Unknown Source)
at org.knime.filehandling.core.defaultnodesettings.filechooser.AbstractFileChooserPathAccessor.walkFileTree(AbstractFileChooserPathAccessor.java:269)
at org.knime.filehandling.core.defaultnodesettings.filechooser.AbstractFileChooserPathAccessor.getFSPaths(AbstractFileChooserPathAccessor.java:231)
at org.knime.filehandling.utility.nodes.listpaths.ListFilesAndFoldersNodeModel.writeOutput(ListFilesAndFoldersNodeModel.java:188)
at org.knime.filehandling.utility.nodes.listpaths.ListFilesAndFoldersNodeModel.execute(ListFilesAndFoldersNodeModel.java:136)
at org.knime.core.node.NodeModel.executeModel(NodeModel.java:588)
at org.knime.core.node.Node.invokeFullyNodeModelExecute(Node.java:1286)
at org.knime.core.node.Node.execute(Node.java:1049)
at org.knime.core.node.workflow.NativeNodeContainer.performExecuteNode(NativeNodeContainer.java:594)
at org.knime.core.node.exec.LocalNodeExecutionJob.mainExecute(LocalNodeExecutionJob.java:98)
at org.knime.core.node.workflow.NodeExecutionJob.internalRun(NodeExecutionJob.java:198)
at org.knime.core.node.workflow.NodeExecutionJob.run(NodeExecutionJob.java:117)
at org.knime.core.util.ThreadUtils$RunnableWithContextImpl.runWithContext(ThreadUtils.java:367)
at org.knime.core.util.ThreadUtils$RunnableWithContext.run(ThreadUtils.java:221)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at org.knime.core.util.ThreadPool$MyFuture.run(ThreadPool.java:123)
at org.knime.core.util.ThreadPool$Worker.run(ThreadPool.java:246)
