Sitecore 10.4 -Fixing Sitecore Installation Errors: .NET Hosting Bundle Download (dotnet-hosting-6.0.21) Fails with "EOF" or "400 Bad Request

When installing Sitecore XP/XM on-premises using SIF (Sitecore Installation Framework), you may run into frustrating issues during the .NET Hosting Bundle download step. The issue often looks like this:

Issue - the download link is not suported as it's tryign to find the old version 

[-------- DownloadDotNetMultiTargeting : DownloadFile ------------------------]

[DownloadDotNetMultiTargeting]:[Download] https://download.visualstudio.microsoft.com/download/pr/b50f2f63-23ed-4c96-9b38-71d319107d1b/26f8c79415eccaef1f2e0614e10cd701/dotnet-hosting-6.0.21-win.exe => C:\Users\jitus\AppData\Local\Temp\dotnet-hosting-win.exe

Error downloading https://download.visualstudio.microsoft.com/download/pr/b50f2f63-23ed-4c96-9b38-71d319107d1b/26f8c79415eccaef1f2e0614e10cd701/dotnet-hosting-6.0.21-win.exe: The underlying connection was closed: The connection was closed unexpectedly.

[TIME] 00:00:19

Error downloading https://download.visualstudio.microsoft.com/download/pr/b50f2f63-23ed-4c96-9b38-71d319107d1b/26f8c79415eccaef1f2e0614e10cd701/dotnet-hosting-6.0.21-win.exe: The underlying connection was closed: The connection was closed unexpectedly.

When I checked the URL, I got 404 to fix the issue

I replace the URL in 

Prerequisites.json

Value https://builds.dotnet.microsoft.com/dotnet/aspnetcore/Runtime/6.0.36/aspnetcore-runtime-6.0.36-win-x64.exe and that fixed the issue

XMC how to fix a network with name ABC-xmc_default exists but was not created by compose

Recently during the new XMC project setup, I got below error

 Starting Sitecore environment...

 level=warning msg="a network with name ABC-xmc_default exists but was not created by compose.\nSet `external: true` to use an existing network"

network ABC-xmc_default was found but has incorrect label com.docker.compose.network set to ""

You cannot call a method on a null-valued expression.

At C:\Projects\ABC-xmc\docker\add-host.ps1:8 char:1

+ $containerId = $containerId.Replace("failed to get console mode for s ...

+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    + CategoryInfo          : InvalidOperation: (:) [], ParentContainsErrorRecordException

    + FullyQualifiedErrorId : InvokeMethodOnNull

Fix

Go to your docker compose overide file and at the last add this lines

networks:

  default:

    external: true

    name: ABC-xmc_default