SFTP Smart Services

Overview

Contains multiple Smart Services for interacting with a remote file server via SFTP, FTP, or SCP. Using these services, an Appian application can be configured to send and receive files, folders, and metadata in a process. Features support for zlib compression.

Key Features & Functionality

Smart Services included:

SFTP:
- Remove Directory Over SFTP (Basic Credentials)
- Send File Over SFTP
- Send File Over SFTP (Basic Credentials)
- Receive File Over SFTP
- Receive File Over SFTP (Basic Credentials)
- Rename File Over SFTP
- Get Remote Directory Contents Over SFTP
- Get Remote Directory Contents Over SFTP (Basic Credentials)
- Create Directory Over SFTP
- Create Directory Over SFTP (Basic Credentials)
SCP:
- Send File Over SCP
- Receive File Over SCP
FTP:
- Send File Over FTP
- Receive File Over FTP
- Receive Folder Over FTP
FTPS
- Receive Folder Over FTPS
- Send File Over FTPS (Basic Credentials)

All smart services in the package use Secure Credentials Store.

sriram.sampathkumar over 2 years ago in reply to raghulvishnud

Process model contains SFTP node start and end node that's it.
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sriram.sampathkumar over 2 years ago in reply to raghulvishnud

Below are the screenshots as requested. Kindly let me know if you need more details
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raghulvishnud over 2 years ago in reply to sriram.sampathkumar

Hi sriram.sampathkumar,

Please share with us the screenshot of the configurations of the SFTP node and also check whether all mandatory fields are passed properly from Appian in both the secure credential store and the process model.
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sriram.sampathkumar over 2 years ago

I am trying to send a file and it gives me the below error. I have checked the documentation and everything is configured as expected.

 [Appian Work Item - 11 - execution02 : UnattendedJavaActivityRequest] ERROR com.appian.ps.plugins.sftpsmartservices.SendFileOverSFTP - Error transferring file to SFTP server
java.lang.NullPointerException
	at com.appian.ps.plugins.sftpsmartservices.SendFileOverSFTP.run(SendFileOverSFTP.java:149)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.lambda$call$0(DefaultActivityExecutor.java:136)
	at com.appiancorp.plugins.PluginUsageLogger.runWithPluginInformation(PluginUsageLogger.java:52)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:136)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:130)
	at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:27)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:130)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:88)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequestResponseCreator.getJavaActivityResultResponse(UnattendedJavaActivityRequestResponseCreator.java:21)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.getJavaActivityResultResponse(UnattendedJavaActivityRequest.java:67)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
	at com.appiancorp.common.persistence.data.AppianDataUserContextProvider.executeWithConsistentDataReads(AppianDataUserContextProvider.java:116)
	at com.appiancorp.process.engine.ProcessContinuationRequest.executeOuter(ProcessContinuationRequest.java:68)
	at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:124)
	at com.appiancorp.process.workpoller.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:36)
	at com.appiancorp.process.workpoller.WorkItem.run(WorkItem.java:94)
	at org.springframework.jca.work.SimpleTaskWorkManager$DelegatingWorkAdapter.run(SimpleTaskWorkManager.java:239)
	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)

raghulvishnud over 2 years ago in reply to TJ

Hi Tj,

The Cause of the issue is only due to network restrictions .Please try to manually/use file transfer tool like winscp to transfer a file through sftp from the appian machine .Please share us if you are able to do the same
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TJ over 2 years ago in reply to raghulvishnud

Above is just sample endpoint as I can't disclose actual endpoint over here. However I had asked support from Appian and they replied that they are able to connect to endpoint from Appian so its not Appian issue and something to do with plugin.
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raghulvishnud over 2 years ago in reply to TJ

Hi From the Error Log ,we can see that the server is trying to connect to https://host.com which is not resolvable from your machines network resulting in a unknown host exception .

Please try checking the same from your side
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TJ over 2 years ago

I am trying to send document using 'Send File Over SFTP' but receiving below error:

2021-12-07 13:26:29,772 [Appian Work Item - 54497 - execution00 : UnattendedJavaActivityRequest] ERROR com.appian.ps.plugins.sftpsmartservices.SendFileOverSFTP - Error connecting to remote SFTP server
com.jcraft.jsch.JSchException: java.net.UnknownHostException: https://host.com
at com.jcraft.jsch.Util.createSocket(Util.java:349)
at com.jcraft.jsch.Session.connect(Session.java:215)
at com.jcraft.jsch.Session.connect(Session.java:183)
at com.appian.ps.plugins.sftpsmartservices.SFTPConfig.connect(SFTPConfig.java:178)
at com.appian.ps.plugins.sftpsmartservices.SendFileOverSFTP.run(SendFileOverSFTP.java:140)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.lambda$call$0(DefaultActivityExecutor.java:131)
at com.appiancorp.plugins.PluginUsageLogger.runWithPluginInformation(PluginUsageLogger.java:52)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:131)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:125)
at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:27)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:125)
at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:88)
at com.appiancorp.process.engine.UnattendedJavaActivityRequestResponseCreator.getJavaActivityResultResponse(UnattendedJavaActivityRequestResponseCreator.java:21)
at com.appiancorp.process.engine.UnattendedJavaActivityRequest.getJavaActivityResultResponse(UnattendedJavaActivityRequest.java:67)
at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
at com.appiancorp.common.persistence.data.AppianDataUserContextProvider.executeWithConsistentDataReads(AppianDataUserContextProvider.java:116)
at com.appiancorp.process.engine.ProcessContinuationRequest.executeOuter(ProcessContinuationRequest.java:68)
at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:123)
at com.appiancorp.process.workpoller.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:36)
at com.appiancorp.process.workpoller.WorkItem.run(WorkItem.java:94)
at org.springframework.jca.work.SimpleTaskWorkManager$DelegatingWorkAdapter.run(SimpleTaskWorkManager.java:239)
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)
Caused by: java.net.UnknownHostException: https://host.com
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
at java.net.VPNSocketImpl.connect(VPNSocketImpl.java:50)
at java.net.Socket.connect(Socket.java:607)
at java.net.Socket.connect(Socket.java:556)
at java.net.Socket.<init>(Socket.java:452)
at java.net.Socket.<init>(Socket.java:229)
at com.jcraft.jsch.Util.createSocket(Util.java:343)
... 23 more
2021-12-07 13:26:29,773 [Appian Work Item - 54497 - execution00 : UnattendedJavaActivityRequest] ERROR com.appian.ps.plugins.sftpsmartservices.SendFileOverSFTP - Error transferring file to SFTP server
java.lang.NullPointerException
at com.appian.ps.plugins.sftpsmartservices.SendFileOverSFTP.run(SendFileOverSFTP.java:149)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.lambda$call$0(DefaultActivityExecutor.java:131)
at com.appiancorp.plugins.PluginUsageLogger.runWithPluginInformation(PluginUsageLogger.java:52)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:131)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:125)
at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:27)
at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:125)
at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:88)
at com.appiancorp.process.engine.UnattendedJavaActivityRequestResponseCreator.getJavaActivityResultResponse(UnattendedJavaActivityRequestResponseCreator.java:21)
at com.appiancorp.process.engine.UnattendedJavaActivityRequest.getJavaActivityResultResponse(UnattendedJavaActivityRequest.java:67)
at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
at com.appiancorp.common.persistence.data.AppianDataUserContextProvider.executeWithConsistentDataReads(AppianDataUserContextProvider.java:116)
at com.appiancorp.process.engine.ProcessContinuationRequest.executeOuter(ProcessContinuationRequest.java:68)
at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:123)
at com.appiancorp.process.workpoller.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:36)
at com.appiancorp.process.workpoller.WorkItem.run(WorkItem.java:94)
at org.springframework.jca.work.SimpleTaskWorkManager$DelegatingWorkAdapter.run(SimpleTaskWorkManager.java:239)
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)

Has anyone faced similar issues? Please let me know if you have any inputs on this.
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raghulvishnud over 3 years ago in reply to andrese378

Hi, Can you please elaborate a little Before the 7-8th document everything works fine, but after this, it starts to throw a timeout exception, so it will help us identify the root cause?

The configurations of the node how the instances are triggered (MNI or default), are you trying with a combination of getting directory contents followed by receive file over sftp, The above information will help us to replicate and identify a fix for the issue

From the error, we can see the issue is related to connectivity the Client is unable to read the entire contents before the timeout is configured. From a code perspective no upper bound time limit is specified for connection and for each instance of the above operation we are closing the channel
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andrese378 over 3 years ago

Hi!

I'm also having the same problem. I'm trying to get some documents over SFTP.

Before the 7-8th document everithing works fine, but after this it starts to throw a timeout exception,as follows:

2021-11-11 09:20:28,224 [Appian Work Item - 872416 - execution02 : UnattendedJavaActivityRequest] ERROR com.appian.ps.plugins.sftpsmartservices.GetRemoteDirectoryContentsOverSFTP - Error connecting to SFTP server
com.jcraft.jsch.JSchException: Session.connect: java.net.SocketException: Connection timed out (Read failed)
	at com.jcraft.jsch.Session.connect(Session.java:565)
	at com.jcraft.jsch.Session.connect(Session.java:183)
	at com.appian.ps.plugins.sftpsmartservices.SFTPConfig.connect(SFTPConfig.java:178)
	at com.appian.ps.plugins.sftpsmartservices.GetRemoteDirectoryContentsOverSFTP.run(GetRemoteDirectoryContentsOverSFTP.java:65)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.lambda$call$0(DefaultActivityExecutor.java:131)
	at com.appiancorp.plugins.PluginUsageLogger.runWithPluginInformation(PluginUsageLogger.java:52)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:131)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:125)
	at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:27)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:125)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:88)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequestResponseCreator.getJavaActivityResultResponse(UnattendedJavaActivityRequestResponseCreator.java:21)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.getJavaActivityResultResponse(UnattendedJavaActivityRequest.java:67)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
	at com.appiancorp.common.persistence.data.AppianDataUserContextProvider.executeWithConsistentDataReads(AppianDataUserContextProvider.java:116)
	at com.appiancorp.process.engine.ProcessContinuationRequest.executeOuter(ProcessContinuationRequest.java:68)
	at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:113)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.process(UnattendedJavaActivityRequest.java:41)
	at com.appiancorp.process.engine.ProcessEngineServiceImpl.processUnattendedRequest(ProcessEngineServiceImpl.java:162)
	at com.appiancorp.process.engine.ProcessEngineServiceImpl.processToNextAttended(ProcessEngineServiceImpl.java:228)
	at sun.reflect.GeneratedMethodAccessor2934.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.appiancorp.util.MethodInvocationReflectionImpl.proceed(MethodInvocationReflectionImpl.java:23)
	at com.appiancorp.security.authz.AuthorizationMethodInterceptor.invoke(AuthorizationMethodInterceptor.java:54)
	at com.appiancorp.services.ServiceManager$ServiceInvocationHandler.invoke(ServiceManager.java:479)
	at com.sun.proxy.$Proxy298.processToNextAttended(Unknown Source)
	at com.appiancorp.process.design.service.ProcessDesignServiceXmlImpl.initiateProcess(ProcessDesignServiceXmlImpl.java:1052)
	at com.appiancorp.process.design.service.ExtendedProcessDesignServiceJavaImpl.initiateProcessWithFullResult(ExtendedProcessDesignServiceJavaImpl.java:390)
	at sun.reflect.GeneratedMethodAccessor2933.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.appiancorp.kougar.services.KougarServiceInvocationHandler$JavaInvocationHandler.invoke(KougarServiceInvocationHandler.java:106)
	at com.appiancorp.kougar.services.KougarServiceInvocationHandler$KougarMethodInvocation.proceed(KougarServiceInvocationHandler.java:287)
	at com.appiancorp.security.authz.AuthorizationMethodInterceptor.invoke(AuthorizationMethodInterceptor.java:54)
	at com.appiancorp.kougar.services.KougarServiceInvocationHandler.invoke(KougarServiceInvocationHandler.java:324)
	at com.sun.proxy.$Proxy27.initiateProcessWithFullResult(Unknown Source)
	at com.appiancorp.process.runtime.activities.StartProcessSmartService2.run(StartProcessSmartService2.java:99)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:129)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:125)
	at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:27)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:125)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:88)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequestResponseCreator.getJavaActivityResultResponse(UnattendedJavaActivityRequestResponseCreator.java:21)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.getJavaActivityResultResponse(UnattendedJavaActivityRequest.java:67)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
	at com.appiancorp.common.persistence.data.AppianDataUserContextProvider.executeWithConsistentDataReads(AppianDataUserContextProvider.java:116)
	at com.appiancorp.process.engine.ProcessContinuationRequest.executeOuter(ProcessContinuationRequest.java:68)
	at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:123)
	at com.appiancorp.process.workpoller.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:36)
	at com.appiancorp.process.workpoller.WorkItem.run(WorkItem.java:94)
	at org.springframework.jca.work.SimpleTaskWorkManager$DelegatingWorkAdapter.run(SimpleTaskWorkManager.java:239)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
2021-11-11 09:20:28,224 [Appian Work Item - 872416 - execution02 : UnattendedJavaActivityRequest] ERROR com.appiancorp.process.engine.UnattendedJavaActivityRequest - An error occurred while executing activity: id=268444294, classname=com.appian.ps.plugins.sftpsmartservices.GetRemoteDirectoryContentsOverSFTP
com.appiancorp.suiteapi.process.exceptions.SmartServiceException: userMsg[error.sftp_conn=Error establishing SFTP connection. Confirm your hostname, username and password. See application server log for more details. Error Message: Session.connect: java.net.SocketException: Connection timed out (Read failed)]
	at com.appiancorp.suiteapi.process.exceptions.SmartServiceException$Builder.build(SmartServiceException.java:145)
	at com.appian.ps.plugins.sftpsmartservices.GetRemoteDirectoryContentsOverSFTP.createException(GetRemoteDirectoryContentsOverSFTP.java:203)
	at com.appian.ps.plugins.sftpsmartservices.GetRemoteDirectoryContentsOverSFTP.run(GetRemoteDirectoryContentsOverSFTP.java:70)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.lambda$call$0(DefaultActivityExecutor.java:131)
	at com.appiancorp.plugins.PluginUsageLogger.runWithPluginInformation(PluginUsageLogger.java:52)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:131)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:125)
	at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:27)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:125)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:88)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequestResponseCreator.getJavaActivityResultResponse(UnattendedJavaActivityRequestResponseCreator.java:21)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.getJavaActivityResultResponse(UnattendedJavaActivityRequest.java:67)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
	at com.appiancorp.common.persistence.data.AppianDataUserContextProvider.executeWithConsistentDataReads(AppianDataUserContextProvider.java:116)
	at com.appiancorp.process.engine.ProcessContinuationRequest.executeOuter(ProcessContinuationRequest.java:68)
	at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:113)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.process(UnattendedJavaActivityRequest.java:41)
	at com.appiancorp.process.engine.ProcessEngineServiceImpl.processUnattendedRequest(ProcessEngineServiceImpl.java:162)
	at com.appiancorp.process.engine.ProcessEngineServiceImpl.processToNextAttended(ProcessEngineServiceImpl.java:228)
	at sun.reflect.GeneratedMethodAccessor2934.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.appiancorp.util.MethodInvocationReflectionImpl.proceed(MethodInvocationReflectionImpl.java:23)
	at com.appiancorp.security.authz.AuthorizationMethodInterceptor.invoke(AuthorizationMethodInterceptor.java:54)
	at com.appiancorp.services.ServiceManager$ServiceInvocationHandler.invoke(ServiceManager.java:479)
	at com.sun.proxy.$Proxy298.processToNextAttended(Unknown Source)
	at com.appiancorp.process.design.service.ProcessDesignServiceXmlImpl.initiateProcess(ProcessDesignServiceXmlImpl.java:1052)
	at com.appiancorp.process.design.service.ExtendedProcessDesignServiceJavaImpl.initiateProcessWithFullResult(ExtendedProcessDesignServiceJavaImpl.java:390)
	at sun.reflect.GeneratedMethodAccessor2933.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.appiancorp.kougar.services.KougarServiceInvocationHandler$JavaInvocationHandler.invoke(KougarServiceInvocationHandler.java:106)
	at com.appiancorp.kougar.services.KougarServiceInvocationHandler$KougarMethodInvocation.proceed(KougarServiceInvocationHandler.java:287)
	at com.appiancorp.security.authz.AuthorizationMethodInterceptor.invoke(AuthorizationMethodInterceptor.java:54)
	at com.appiancorp.kougar.services.KougarServiceInvocationHandler.invoke(KougarServiceInvocationHandler.java:324)
	at com.sun.proxy.$Proxy27.initiateProcessWithFullResult(Unknown Source)
	at com.appiancorp.process.runtime.activities.StartProcessSmartService2.run(StartProcessSmartService2.java:99)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:129)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:125)
	at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:27)
	at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:125)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:88)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequestResponseCreator.getJavaActivityResultResponse(UnattendedJavaActivityRequestResponseCreator.java:21)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.getJavaActivityResultResponse(UnattendedJavaActivityRequest.java:67)
	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
	at com.appiancorp.common.persistence.data.AppianDataUserContextProvider.executeWithConsistentDataReads(AppianDataUserContextProvider.java:116)
	at com.appiancorp.process.engine.ProcessContinuationRequest.executeOuter(ProcessContinuationRequest.java:68)
	at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:123)
	at com.appiancorp.process.workpoller.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:36)
	at com.appiancorp.process.workpoller.WorkItem.run(WorkItem.java:94)
	at org.springframework.jca.work.SimpleTaskWorkManager$DelegatingWorkAdapter.run(SimpleTaskWorkManager.java:239)
	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)
Caused by: com.jcraft.jsch.JSchException: Session.connect: java.net.SocketException: Connection timed out (Read failed)
	at com.jcraft.jsch.Session.connect(Session.java:565)
	at com.jcraft.jsch.Session.connect(Session.java:183)
	at com.appian.ps.plugins.sftpsmartservices.SFTPConfig.connect(SFTPConfig.java:178)
	at com.appian.ps.plugins.sftpsmartservices.GetRemoteDirectoryContentsOverSFTP.run(GetRemoteDirectoryContentsOverSFTP.java:65)
	... 51 more

Any ideas about this issue?