What is the best way to remotely access a Raspberry Pi without port forwarding?

Question

linux

Stands in the Raspberry shopping center, plays music via http. Sometimes you need intervention, you have to go through the whole city to look ...
No one will let you go to the routers of the shopping center. I can't forward the port for ssh. VNC also seems to require port forwarding...
I'm not a devops or a sysadmin. But the task fell on my shoulders.
What options are there?

Answer 1

Well, for example, Raspeberry itself connects somewhere, to some kind of your VPN server.

Answer 2

https://putty.org.ru/articles/putty-ssh-tunnels.html here is a reverse forwarding of tunnels through an external server

Answer 3

I did it through one place:
On a free hosting, I wrote a php script to update to ngrok url redirects.
I wrote a script on the server to create an ngrok url and send a post request to the hosting. And ngrok tunnels very simply

Answer 4

1) You can teach Malinka to independently establish a VPN connection with some server that has a "white" IP address (or with a server that has a forwarded TCP port).
2) In this case, forwarding the SSh tunnel is quite suitable - this is the easiest. Look for an article on Habré.
3) There are perverted methods. But today I'm too lazy to pervert.

Answer 5

Maybe ngrok.io is for you . I think you can find the instructions yourself. Allows you to forward ports through your servers. You can forward one port for free.