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https://issues.apache.org/jira/browse/GUACAMOLE-997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17076535#comment-17076535
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Mike Jumper commented on GUACAMOLE-997:
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I don't think we should just return any string. The meaning of a read operation
in this context is not defined, nor is it understood why Windows would be
issuing a read request in your case, nor does it make sense that the standard
PostScript driver requested by Guacamole's RDP support would produce such a
request.
Checking the FreeRDP source, their implementation of RDPDR does not return a
string either, but rather {{STATUS_NOT_SUPPORTED}}.
> Printing may fail if RDP server issues a read request
> -----------------------------------------------------
>
> Key: GUACAMOLE-997
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-997
> Project: Guacamole
> Issue Type: Bug
> Components: RDP
> Affects Versions: 1.0.0, 1.1.0, 1.2.0
> Environment: guacd in docker container
> Reporter: VW
> Priority: Minor
> Attachments: guacamole-server_printer_read_reqest_patch.txt
>
>
> A print job is created in the rdp session, but is not issued as a pdf to the
> client.
> Windows 2016/2019 Server
> guacd[839]: DEBUG: Ignoring printer cached configuration data
> guacd[839]: INFO: Print job created
> guacd[839]: INFO: Created PDF filter process PID=862
> guacd[839]: DEBUG: Reading output from filter process...
> guacd[862]: INFO: Running gs
> guacd[839]: ERROR: Unknown printer I/O request function: 0x3/0x0
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