WSUS Deep Dive - Too much information!

I'm just using this as a "notepad" of sorts.
Just took over a site with many downstream WSUS and trying fix the existing issues.
Don't expect a complete solution here!
This will be updated as I go along but then again, maybe not!

WSUS Tips & Tricks:
https://community.spiceworks.com/topic/1677852-how-to-administer-wsus

No update files downloaded in WSUS Content folder:
http://clintboessen.blogspot.sg/2013/09/windows-server-2012-wsus-server-not.html
https://thwack.solarwinds.com/thread/54281
https://social.technet.microsoft.com/Forums/windowsserver/en-US/97e1170e-0506-4cf1-918c-6d472b352ff6/wsus-not-downloading-the-updates?forum=winserverwsus
https://serverfault.com/questions/754267/wsus-upstream-server-is-not-showing-current-downstream-server-status

SQL Script to clean WSUS:
https://community.spiceworks.com/scripts/show/2998-adamj-clean-wsus

WSUS Error Codes:
8024401F - Equivalent to a HTTP 500 error; IIS had an internal server error while processing download request; check your default ports on WSUS if they match GPO settings. If that's not the issue see this:- http://kaustubhghanekar.blogspot.sg/2011/05/advanced-wsus-troubleshooting-for-error.html

WSUS Error Codes Database:
http://inetexplorer.mvps.org/archive/windows_update_codes.htm

Script for WSUS cleanup:
https://docs.microsoft.com/en-us/powershell/module/wsus/invoke-wsusservercleanup?view=win10-ps

Troubleshooting:
IIS Logs C:\inetpub\logs\LogFiles

Alternative method of deploying drivers from WSUS:
https://decentsecurity.com/drivers-through-wsus/

Downloading Drivers using WSUS:
http://www.runonazure.com/downloading-drivers-into-wsus-bad-idea/
https://blogs.technet.microsoft.com/sus/2008/08/20/a-large-number-of-driver-updates-showing-up-in-wsus/
http://www.runonazure.com/downloading-drivers-into-wsus-bad-idea/

Deleting WID:
https://systemspecialist.net/2013/05/15/move-or-delete-a-wsus-4-windows-internal-database-wid-on-windows-server-2012/

Windows 10 Insider Preview update issues from build 15007 to 15019; this probably will apply to some situations outside this scenario.

For those of you on Windows Insider Preview 10 build 15007 trying to move up to build 15019, go to services, disable "Delivery Optimization" service, reboot and retry. I used the Resource Manager to monitor network connections out and notice that after disabling the "Delivery Optimization" service, "svchost.exe (netsvcs)", started receiving incoming data. After the download for 15019 was completed, I set the service back to Automatic but did not start it. This is just in case having this in disabled state will mess up future installations. My setup is a VM on VMware Workstation so YMMV. Good luck guys. :)

I've placed the screenshots of the process in a public post on Facebook for reference:
https://www.facebook.com/midus/posts/10154325183861724