Rails 5 Faraday connection for Facebook Omniauth - ruby

Question

I have tried all the tricks in the book and all the possible solution in stack over flow.But still couldn't figure out the problem. The program pauses at the call back initiated stage and shows faraday connection : timed out. I have the following code:
gem 'omniauth', '~> 1.3', '>= 1.3.1'
gem 'omniauth-facebook'
Routes.rb
devise_for :users,
:path => '',
:path_names => {:sign_in => 'login', :sign_out => 'logout', :edit => 'profile' },
:controllers => {:omniauth_callbacks => 'omniauth_callbacks'}
/Controller.rb
class OmniauthCallbacksController < Devise::OmniauthCallbacksController
def facebook
#user = User.from_omniauth(request.env["omniauth.auth"])
if #user.persisted?
sign_in_and_redirect #user, :event => :authentication
set_flash_message(:notice, :success, :kind => "Facebook") if is_navigational_format?
else
session["devise.facebook_data"] = request.env["omniauth.auth"].except("extra")
redirect_to new_user_registration_url
end
end
end
/user.rb
class User < ApplicationRecord
def self.from_omniauth(auth)
user = User.where(email: auth.info.email).first
if user
return user
else
where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
user.provider = auth.provider
user.uid = auth.uid
user.email = auth.info.email
user.image = auth.info.image
user.password = Devise.friendly_token[0,20]
user.firstname = auth.info.first_name
user.lastname = auth.info.last_name
user.phonenumber == '0000000000'
user.tc == true
user.year == true
end
end
end
end
/devise.rb
config.omniauth:facebook,ENV['FACEBOOK_ID'],ENV['FACEBOOK_SECRET'],scope:'email',info_fields:'email,first_name,last_name'