Cannot connect while using Resize Method 'Display Update'

[Thomas Marsh <ma...@gmail.com>]

We are currently running Guacamole on an Alpine 3.15 container and trying
to connect to a Windows 2019 server hosted on an EC2 instance. Recently,
when connecting with 'Resize Method' set to 'Display Update (RDP8.1+)' we
started receiving the red banner -"The remote desktop server is currently
unavailable". When changing the resize method to 'blank' or 'reconnect', it
works as expected. I tried updating to Alpine 3.16 with the same results.

Guacd shows...

INFO: Resize Method: display update
INFO: No clipboard line-ending normalisation specified
INFO: User 'xxxxxxxx' joined connected
INFO: Loading keymap 'base'
INFO: Loading keymap 'en-us-qwerty'
ERROR: Connection closed
INFO: Internal RDP client disconnected
(unable to copy-paste verbatim, but these are what the logs look like, in
that order)

Have you come across this issue before by any chance?

Thanks,

Re: Cannot connect while using Resize Method 'Display Update'

[Michael Jumper <mj...@apache.org>]

On Mon, Sep 5, 2022, 09:34 Thomas Marsh <ma...@gmail.com>
wrote:

> We are currently running Guacamole on an Alpine 3.15 container and trying
> to connect to a Windows 2019 server hosted on an EC2 instance. Recently,
> when connecting with 'Resize Method' set to 'Display Update (RDP8.1+)' we
> started receiving the red banner -"The remote desktop server is currently
> unavailable". When changing the resize method to 'blank' or 'reconnect', it
> works as expected. I tried updating to Alpine 3.16 with the same results.
>
> Guacd shows...
>
> INFO: Resize Method: display update
> INFO: No clipboard line-ending normalisation specified
> INFO: User 'xxxxxxxx' joined connected
> INFO: Loading keymap 'base'
> INFO: Loading keymap 'en-us-qwerty'
> ERROR: Connection closed
> INFO: Internal RDP client disconnected
> (unable to copy-paste verbatim, but these are what the logs look like, in
> that order)
>
> Have you come across this issue before by any chance?
>

My guess would be that something is wrong with the way FreeRDP is installed
that is resulting in the FreeRDP plugin implementing the Display Update
channel not being found.

Do you see this if you try building the latest from git? We recently
switched the base of that image to Alpine.

What about debug-level logging?

- Mike