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https://issues.apache.org/jira/browse/GUACAMOLE-506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17027534#comment-17027534
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Chase Lau commented on GUACAMOLE-506:
-------------------------------------
I've tried recreating this on the latest Guacamole build and can confirm
something is up. I tested by changing `network.websocket.max-connections` in
Firefox to 0 and then attempting to print. The print job will actually
complete, but then I'm immediately disconnected from the session. Last few logs
are here:
{{Jan 31 08:14:06 XXX server[1116]: 08:14:06.696 [http-nio-8080-exec-8] INFO
o.a.g.tunnel.TunnelRequestService - User "chase" disconnected from connection
"36". Duration: 69508 milliseconds}}
{{Jan 31 08:14:06 }}{{XXX}}{{ server[1116]: 08:14:06.704
[http-nio-8080-exec-17] INFO o.a.g.tunnel.TunnelRequestService - User "chase"
disconnected from connection "36". Duration: 69515 milliseconds}}
{{Jan 31 08:14:06 }}{{XXX}}{{ server[1116]: 08:14:06.704 [http-nio-8080-exec-8]
ERROR o.a.g.s.GuacamoleHTTPTunnelServlet - HTTP tunnel request failed:
Connection to guacd timed out.}}
{{Jan 31 08:14:06 }}{{XXX}}{{ server[1116]: 08:14:06.955
[http-nio-8080-exec-35] WARN o.a.g.s.GuacamoleHTTPTunnelServlet - HTTP tunnel
request rejected: No such tunnel.}}
> Printing does not work via HTTP, only via websocket
> ---------------------------------------------------
>
> Key: GUACAMOLE-506
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-506
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-client, RDP
> Affects Versions: 0.9.13-incubating, 0.9.14
> Reporter: Jonathan Hunter
> Priority: Minor
>
> Printing does not work (for me, at least) when using guacamole via an Apache
> reverse proxy *in HTTP mode*. I think that this counts as a bug - since
> everything else i.e. normal interactive use of guacamole RDP/VNC/SSH/etc.
> sessions work fine in this configuration, i.e. without websockets, just http
> reverse proxying.
>
> The following two steps got printing going for me, but I think printing
> _should_ work via HTTP...
> * Install Apache's mod_proxy_wstunnel (on Debian this is 'sudo a2enmod
> proxy_wstunnel')
> * Add a line in Apache's config to websocket-proxy the relevant URL. (Note
> that this line must come *before* the config entry that proxies the rest of
> guacamole, since Apache's ProxyPass command operates on a first match wins
> basis.)
>
> (I did look at Chapter 4 of the documentation, and in particular the
> 'Proxying with websocket' section, but I found I did not need the
> ProxyPassReverse statement shown there; nor did I need to place it within a
> <Location> section, in my config at least.)
>
> My Apache config now looks like this:
> {quote}{{ ProxyPass /remoteaccess/websocket-tunnel
> {color:#d04437}ws{color}://docker.host:5678/guacamole/websocket-tunnel}}
> {{ ProxyPass /remoteaccess/ {color:#d04437}
> {color}[{color:#d04437}http{color}://docker.host:5678/guacamole/]}}
> {quote}
>
> and printing now works perfectly.
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