Apache Guacamole: RDP printer not working, “error parsing HTTP request header”, “Invalid character found” etc

Posted on October 4, 2019 by Dae

If you’re using Apache Guacamole 1.0.0 behind an nginx reverse proxy, and Guacamole’s RDP printer doesn’t work, and browser console logs error 400, welcome to read further.

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Apache Guacamole: how to change the default URL path (/guacamole) to something else

Posted on October 4, 2019 by Dae

Say you want to change Apache Guacamole’s URL from http://server:8080/guacamole to something like http://server:8080/my-hidden-guacamole-instance (or perhaps you’re using nginx to proxy requests to Guacamole / Tomcat and you don’t want any path at all).

(See Docker image specific instructions in the comments section below).

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Posted in How to’s | Tagged | 9 Comments

macOS High Sierra: Spotlight search not working — “Database mapping failed” error spammed to the system log

Posted on July 14, 2019 by Dae

Solution can be found here (read the post that starts from “I’ve solved this…” by Design Complex).

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macOS High Sierra doesn’t start after updating (stuck on Apple logo) — “failed to unwrap volume key” error

Posted on July 14, 2019 by Dae

The first thing you want to do when your Mac system doesn’t start is to start up into the verbose mode to see if there any error messages. Don’t try to fix the problem before diagnosing!

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Windows Server 2019: RD Session Host — ChangeMode “Invalid operation” exception

Posted on May 3, 2019 by Dae

If you’re changing the client access licensing mode of your RD Session Host using the PowerShell $obj.ChangeMode(…) command and it fails with an error saying “Exception … Invalid operation”…

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Windows Server 2019: Remote Desktop License Issue with User CALs

Posted on May 3, 2019 by Dae

If you’re getting the following error message upon connecting to your Windows Server 2019-based Remote Desktop Session Host that is not joined to a domain:

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“Install %OS%.app does not appear to be a valid OS installer application” (createinstallmedia error)

Posted on May 2, 2019 by Dae

If you’re trying to create a bootable installer for an older macOS version (like El Capitan) with createinstallmedia, and it fails with a “does not appear to be a valid OS installer” error, quite possible the actual problem is that the digital certificate of your macOS installer has expired. Fortunately, you can easily overcome it by travelling back in time (from the operating system’s perspective, at least).

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Downgrade any Homebrew package easily

Posted on March 21, 2019 by Dae

Update from 2020: the instructions for tesseract don’t work anymore, see comments from other users below the post.

I’ll use Tesseract as an example, but the same logic can be applied to any other Homebrew package.

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“MagickWand shared library not found” on uwsgi

Posted on January 13, 2019 by Dae

If you’re getting this error while deploying a Python app on uwsgi:

MagickWand shared library not found. You probably had not installed ImageMagick library. Try to install: apt-get install libmagickwand-dev

It may not be what it seems: Wand’s load_library() function would show this error message even if it found the shared library in question, but failed to load it for some reason.

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Make VLC show the title of a streaming video

Posted on September 19, 2018 by Dae

I’ve created a tiny VLC extension that makes VLC show the title of the currently playing streaming video. It allows you to set custom titles even for the streams that you don’t own (e.g. from YouTube). For more information, see: https://github.com/EugeneDae/VLC-Show-Stream-Title.

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