A technical problem with the server created an error

[disvroian]

Hello
With Gmail Smtp 2.9.0 and Magento 2.2.7
PHP 7.0.33-50+0~20210501.55+debian1
nginx version: nginx/1.14.2

I try to make it work and i have the following issue "A technical problem with the server created an error. Try again to continue what you were doing. If the problem persists, try again later."
I do have TLS 1.2 activated
I am using the following config

Magento version #:

Magento ver. 2.2.7

Edition (EE, CE, OS, etc):

Debian 4.19.269-1 (2022-12-20) x86_64 GNU/Linux