Error: Cannot connect to SFTP server ; channel is not opened

Hi PI Gurus,
Sender SFTP CC is getting error:
Error: Cannot connect to SFTP server. channel is not opened. (Software version: 3.0.23)
Can anyone guide me, what this error means 'channel is not opened'
Is the issue is at SFTP server location?
Regards,
Krishna Chauhan

Hi,
Now the error has changed:
Session.connect: java.net.SocketTimeoutException: Read timed out
I have increased the pooling interval to 1 Hr from 1 Min. Waiting for the next pooling interval result.
Guide me if I am heading right.... or anything else needs to be done.
Regards,
Krishna Chauhan

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Hi Gurus,
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Summary
Symptom
Some users cannot longer connect SAP GUI to any SAP systems e.g. via SAP Logon, SAPShortcut etc. although they have not made any update to either SAP GUI or SAP system. The attempt to connect to the SAP system ends with error messages like this: "Logon balancing error: could not connect to message server (rc=9)", "service sapmsXXX unknown" or "service sapdp## unknown".
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Other terms
service sapmsXXX unknown,logon balancing,service sapdp## not found error,etc/services,drivers\etc\services,getservbyname, sapdpxx
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Reason and Prerequisites
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Press the rubber button to delete all logged entries.
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Solution provided by Microsoft
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Is the computer join the domain?
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http://blogs.technet.com/b/wbaer/archive/2009/10/06/intermittent-database-server-connectivity-and-microsoft-sharepoint-products-and-technologies.aspx
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Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
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Error: Cannot connect to SFTP server ; channel is not opened

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