Random occurrence of InterruptedException during SFTP connection

Question

We are randomly seeing below error in our stack. Can you please advice in which case these errors would be encountered.

com.enterprisedt.net.j2ssh.SshException: The thread was interrupted whilst waiting for a connection protocol message
   at com.enterprisedt.net.j2ssh.connection.ConnectionProtocol.sendChannelRequest(ConnectionProtocol.java:430)
   at com.enterprisedt.net.j2ssh.subsystem.SubsystemChannel.startSubsystem(SubsystemChannel.java:177)
   at com.enterprisedt.net.j2ssh.sftp.SftpSubsystemClient.initialize(SftpSubsystemClient.java:1038)
   at com.enterprisedt.net.j2ssh.SshClient.openSftpChannel(SshClient.java:1094)
   at com.enterprisedt.net.j2ssh.SftpClient.<init>(SftpClient.java:187)
   at com.enterprisedt.net.j2ssh.SshClient.openSftpClient(SshClient.java:982)
   at com.enterprisedt.net.j2ssh.SshClient.openSftpClient(SshClient.java:963)
   at com.enterprisedt.net.ftp.ssh.SSHFTPClient.connect(SSHFTPClient.java:944)
   at companyx.tk.util.ftp.connector.TRINGTRINGSFTPConnector.connectToRead(TRINGTRINGSFTPConnector.java:92)
   at companyx.tk.util.ftp.connector.TRINGTRINGSFTPConnector.connect(TRINGTRINGSFTPConnector.java:468)
   at companyx.tk.util.interfaces.TRINGTRINGSFTPReceiverIEAdapter.init(TRINGTRINGSFTPReceiverIEAdapter.java:76)
   at companyx.tk.util.TRINGTRINGIEAdapterConfig.timerRun(TRINGTRINGIEAdapterConfig.java:102)
   at com.calypso.tk.util.Timer.run(Timer.java:100)
   at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.InterruptedException
   at java.lang.Object.wait(Native Method)
   at com.enterprisedt.net.j2ssh.transport.SshMessageStore.getMessage(SshMessageStore.java:176)
   at com.enterprisedt.net.j2ssh.connection.ConnectionProtocol.sendChannelRequest(ConnectionProtocol.java:410)
   ... 13 more

Answer 1

If you enable logging, you should see a message something like the below immediately before the exception is thrown:

Timeout expired waiting for server response

So this indicates that the client failed to receive a response from the server within the timeout period.  If you have access to the server logs, then I suggest checking in there for clues.

Comments

The timeout parameter is set via the setTimeout() method.

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Thanks team for this information.