При установке репозитариев node через кеширующих прокси сервер apt-cacher-ng на Ubuntu 20.04 Server для нужд сервиса rTorrent столкнулся с невозможность обращения/получения репозитариев. Команда уходила в ошибку ниже указанную:

ekzorchik@srv-us2004b:~$ curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -

Err:1 https://deb.nodesource.com/node_14.x focal InRelease

Invalid response from proxy: HTTP/1.0 403 CONNECT denied (ask the admin to allow HTTPS tunnels) [IP: 172.35.35.16 3142]

W: Failed to fetch https://deb.nodesource.com/node_14.x/dists/focal/InRelease  Invalid response from proxy: HTTP/1.0 403 CONNECT denied (ask the admin to allow HTTPS tunnels) [IP: 172.35.35.16 3142]

W: Some index files failed to download. They have been ignored, or old ones used instead.

root@ekzorchik:~# ssh -l ekzorchik 172.35.35.16

ekzorchik@srv-cache:~$ sudo nano /etc/apt-cacher-ng/acng.conf

#добавляю параметр и экранируем символ точки

PassThroughPattern: deb\.nodesource\.com:443$

# или можно разрешить все ресурсы

# Or you can simply allow CONNECT for every https host:

# PassThroughPattern: .*
ekzorchik@srv-cache:~$ sudo systemctl restart apt-cacher-ng && sudo systemctl status apt-cacher-ng | head -n5

● apt-cacher-ng.service - Apt-Cacher NG software download proxy

Loaded: loaded (/lib/systemd/system/apt-cacher-ng.service; enabled; vendor preset: enabled)

Active: active (running) since Wed 2022-04-20 13:14:48 MSK; 17ms ago

Main PID: 12091 (apt-cacher-ng)

Tasks: 1 (limit: 2314)

ekzorchik@srv-cache:~$

А после возвращаюсь к системе где устанавливаю репозитарии node и все успешно проходит:

ekzorchik@srv-us2004b:~$ curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -

## Installing the NodeSource Node.js 14.x repo...

## Populating apt-get cache...

+ apt-get update

Get:1 https://deb.nodesource.com/node_14.x focal InRelease [4,583 B]

Get:2 https://deb.nodesource.com/node_14.x focal/main amd64 Packages [775 B]

Hit:3 http://ru.archive.ubuntu.com/ubuntu focal InRelease

Hit:4 http://ru.archive.ubuntu.com/ubuntu focal-updates InRelease

Hit:5 http://ru.archive.ubuntu.com/ubuntu focal-backports InRelease

Hit:6 http://ru.archive.ubuntu.com/ubuntu focal-security InRelease

Fetched 5,358 B in 2s (3,227 B/s)

Reading package lists... Done

## Confirming "focal" is supported...

+ curl -sLf -o /dev/null 'https://deb.nodesource.com/node_14.x/dists/focal/Release'

## Adding the NodeSource signing key to your keyring...

+ curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | gpg --dearmor | tee /usr/share/keyrings/nodesource.gpg >/dev/null

## Creating apt sources list file for the NodeSource Node.js 14.x repo...

+ echo 'deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_14.x focal main' > /etc/apt/sources.list.d/nodesource.list

+ echo 'deb-src [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_14.x focal main' >> /etc/apt/sources.list.d/nodesource.list

## Running `apt-get update` for you...

+ apt-get update

Hit:1 https://deb.nodesource.com/node_14.x focal InRelease

Hit:2 http://ru.archive.ubuntu.com/ubuntu focal InRelease

Hit:3 http://ru.archive.ubuntu.com/ubuntu focal-updates InRelease

Hit:4 http://ru.archive.ubuntu.com/ubuntu focal-backports InRelease

Hit:5 http://ru.archive.ubuntu.com/ubuntu focal-security InRelease

Reading package lists... Done

## Run `sudo apt-get install -y nodejs` to install Node.js 14.x and npm

## You may also need development tools to build native addons:

sudo apt-get install gcc g++ make

## To install the Yarn package manager, run:

curl -sL https://dl.yarnpkg.com/debian/pubkey.gpg | gpg --dearmor | sudo tee /usr/share/keyrings/yarnkey.gpg >/dev/null

echo "deb [signed-by=/usr/share/keyrings/yarnkey.gpg] https://dl.yarnpkg.com/debian stable main" | sudo tee /etc/apt/sources.list.d/yarn.list

sudo apt-get update && sudo apt-get install yarn

ekzorchik@srv-us2004b:~$

И еще один нюанс устранения в мою копилку наработок.

На этом задача все, с уважением автор блога Олло Александр aka ekzorchik.