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https://issues.apache.org/jira/browse/GUACAMOLE-39?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17934498#comment-17934498
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Michael Jobst commented on GUACAMOLE-39:
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We faced the same problem so we duplicated the connection without sftp enabled
as a backup solution.
> Allow connections to continue if SFTP is unavailable
> ----------------------------------------------------
>
> Key: GUACAMOLE-39
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-39
> Project: Guacamole
> Issue Type: Wish
> Components: RDP, SSH, VNC
> Reporter: Mike Jumper
> Priority: Minor
>
> {panel:bgColor=#FFFFEE}
> *The description of this issue was copied from
> [GUAC-1509|https://glyptodon.org/jira/browse/GUAC-1509], an issue in the JIRA
> instance used by the Guacamole project prior to its acceptance into the
> Apache Incubator.*
> Comments, attachments, related issues, and history from prior to acceptance
> *have not been copied* and can be found instead at the original issue.
> {panel}
> If a connection is configured to have SFTP support for file transfers with
> VNC, and the SFTP server goes down or is not connectable for any reason, the
> system can not be accessed. The Home, Reconnect, Logout dialog is displayed.
> From the guacd log:
> {code:none}
> Mar 3 10:20:25 guacd-server guacd[18646]: Protocol "vnc" selected
> Mar 3 10:20:25 guacd-server guacd[18646]: Connection ID is
> "$7ee12ae4-2a1d-4d4a-994c-ea2a4c4f9c02"
> Mar 3 10:20:25 guacd-server guacd[18646]: VNC server supports protocol
> version 3.8 (viewer 3.8)
> Mar 3 10:20:25 guacd-server guacd[18646]: We have 1 security types to read
> Mar 3 10:20:25 guacd-server guacd[18646]: 0) Received security type 2
> Mar 3 10:20:25 guacd-server guacd[18646]: Selecting security type 2 (0/1 in
> the list)
> Mar 3 10:20:25 guacd-server guacd[18646]: Selected Security Scheme 2
> Mar 3 10:20:25 guacd-server guacd[18646]: VNC authentication succeeded
> Mar 3 10:20:25 guacd-server guacd[18646]: Desktop name "Windows8"
> Mar 3 10:20:25 guacd-server guacd[18646]: Connected to VNC server, using
> protocol version 3.8
> Mar 3 10:20:25 guacd-server guacd[18646]: VNC server default format:
> Mar 3 10:20:25 guacd-server guacd[18646]: 32 bits per pixel.
> Mar 3 10:20:25 guacd-server guacd[18646]: Least significant byte first in
> each pixel.
> Mar 3 10:20:25 guacd-server guacd[18646]: TRUE colour: max red 255 green
> 255 blue 255, shift red 16 green 8 blue 0
> Mar 3 10:20:28 guacd-server guacd[18646]: Unable to connect to any addresses.
> Mar 3 10:20:28 guacd-server guacd[18646]: Connection did not succeed
> {code}
> From the guacamole log:
> {code:none}
> 10:20:28.502 [http-bio-8081-exec-3] INFO
> o.g.g.net.basic.TunnelRequestService - User "admin" connected to connection
> "sftptest".
> 10:20:28.515 [http-bio-8081-exec-3] INFO
> o.g.g.net.basic.TunnelRequestService - User "admin" disconnected from
> connection "sftptest". Duration: 13 milliseconds
> {code}
> If the enable-sftp param is changed to false, or deleted, this connection
> succeeds.
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