I have a production server with git version 2.17.1
I'm using capistrano 3.11

Expected behavior

Deploy my project with cap production deploy

Actual behavior

Deploy process stop with
DEBUG [5215ee6f] fatal: ssh variant 'simple' does not support setting port

Solution

In newer version of git (newer than 2.16.0) we have to specify ssh variant
Stackowerflow link

To solve the problem I have to put this code to deploy.rb for git configuration:

set :git_environmental_variables, lambda {
  {
    git_ssh_variant: "ssh",
    git_askpass: "/bin/echo",
    git_ssh: fetch(:git_wrapper_path)
  }
}

It should be a config parameter for deploy.rb to configure ssh_variant.