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https://issues.apache.org/jira/browse/NIFI-7455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17444617#comment-17444617
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Wiktor Kubicki commented on NIFI-7455:
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[~exceptionfactory] this bug is resolved by #NIFI-7443 - Kate worked with me
and i can confirm that issue doesnt exists on 1.15.0.
More tech background - our firewalls drops unused connections (if there were no
KeepAlive packages ) after 30 minutes without letting know back to host.
> FetchSFTP failed to close SFTPClient
> ------------------------------------
>
> Key: NIFI-7455
> URL: https://issues.apache.org/jira/browse/NIFI-7455
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.11.4
> Reporter: Kate Miller
> Priority: Minor
>
> I use ListSftp-FetchSftp pattern and almost every time Fetch gives me warning:
> _"FetchSFTP[id=] Failed to close SFTPClient due to
> net.schmizz.sshj.connection.ConnectionException: Timeout expired: "_
> This problem occurs after the file has been fetched but also when I stop the
> processor. It occurs in many different flowfiles (in different servers, but
> not all of them)
> I used to use the GetSftp before and it worked without any problems.
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