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https://issues.apache.org/jira/browse/GUACAMOLE-1047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Jumper closed GUACAMOLE-1047.
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Resolution: Done
> Notify connecting client on unrecognized connection ID
> ------------------------------------------------------
>
> Key: GUACAMOLE-1047
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1047
> Project: Guacamole
> Issue Type: Improvement
> Components: guacd
> Reporter: Tomer Gabel
> Assignee: Mike Jumper
> Priority: Minor
> Fix For: 1.4.0
>
>
> When a client starts the handshake with an invalid connection ID (i.e. sends
> a {{select}} with an argument prefixed with {{$}}), guacd immediately drops
> the connection. Although this is logged on the server said, the client is
> completely unaware of what's going on.
> Beyond being just plain rude, this makes error reporting and handling
> difficult in some cases. The protocol specifically allows an {{error}}
> command to be sent by the server during the handshake, which would be very
> handy in this case; please expect a pull request addressing this in guacd,
> hopefully it meets the contribution guidelines :)
> (Incidentally, the handshake implementation in guacamole-common's tunneling
> code does not actually handle error commands, expect a separate issue + pull
> request to address that.)
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