Will NAS timeouts interfere with my tunneling?

Question

PHP

If a gray IP server sends a request to a white IP server, can the white IP server send a response indefinitely, thus creating a persistent tunneling connection?
Will NAS timeouts interfere with my tunneling?
Main question.
All questions on the topic:
How to use PHP on a hosting with a "white" IP to make an http tunnel to connect to a server with a "gray" IP, which is behind NAT'om?
How to get http access to a server with a gray IP from the Internet by any means?
There is a technology of clustering. How to optimize it?
How to create a persistent tunneling connection using php?
Will NAS timeouts interfere with my tunneling?
Can php receive and immediately process part of a request without waiting for the request to finish receiving?
Can php send information in chunks?
Most recent discussion.

Answer 1

There is a keep-alive mechanism for this. Almost all vpn services apply this automatically.
During timeouts, an automatic reconnect is made depending on the settings.