Net::OpenTimeout: execution expired while testing the SMTP and when trying to send an activation url
### Summary
Net::OpenTimeout: execution expired while testing the SMTP and when trying to send an activation url
### Steps to reproduce
install gitlab, configure SMTP using extisting config in /etc/gitlab/gitlab.rb
### Example Project
My config:
```
###! **Use smtp instead of sendmail/postfix.**
gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = "mail.<domain>"
gitlab_rails['smtp_port'] = 25
gitlab_rails['smtp_user_name'] = "git@<domain>"
gitlab_rails['smtp_password'] = "<password>"
gitlab_rails['smtp_domain'] = "mail.<domain>"
gitlab_rails['smtp_authentication'] = "login"
gitlab_rails['smtp_enable_starttls_auto'] = false
gitlab_rails['smtp_tls'] = false
gitlab_rails['smtp_force_ssl'] = false
gitlab_rails['smtp_tls'] = false;
gitlab_rails['smtp_openssl_verify_mode'] = 'none'
###! **Can be: 'none', 'peer', 'client_once', 'fail_if_no_peer_cert'**
###! Docs: http://api.rubyonrails.org/classes/ActionMailer/Base.html
gitlab_rails['smtp_openssl_verify_mode'] = 'peer'
```
I have tried both TLS and no encryption, both fail
### What is the current *bug* behavior?
SMTP fails with Net::OpenTimeout: execution expired
### What is the expected *correct* behavior?
Mail sent correctly
### Relevant logs and/or screenshots
```
irb(main):001:0> Notify.test_email('destination_email@address.com', 'Message Subject', 'Message Body').deliver_now
Notify#test_email: processed outbound mail in 482.1ms
^[[D^H
Sent mail to destination_email@address.com (30044.1ms)
Date: Sun, 17 Jun 2018 08:06:25 +0000
From: GitLab <gitlab@git.b<domain>>
Reply-To: GitLab <noreply@<domain>>
To: destination_email@address.com
Message-ID: <5b261681af6ae_3a4e3ff196edb0d033dd@<domain>>
Subject: Message Subject
Mime-Version: 1.0
Content-Type: text/html;
charset=UTF-8
Content-Transfer-Encoding: 7bit
Auto-Submitted: auto-generated
X-Auto-Response-Suppress: All
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><p>Message Body</p></body></html>
Net::OpenTimeout: execution expired
from /opt/gitlab/embedded/lib/ruby/2.3.0/net/smtp.rb:542:in `initialize'
from /opt/gitlab/embedded/lib/ruby/2.3.0/net/smtp.rb:542:in `open'
from /opt/gitlab/embedded/lib/ruby/2.3.0/net/smtp.rb:542:in `tcp_socket'
from /opt/gitlab/embedded/lib/ruby/2.3.0/net/smtp.rb:552:in `block in do_start'
from /opt/gitlab/embedded/lib/ruby/2.3.0/timeout.rb:101:in `timeout'
from /opt/gitlab/embedded/lib/ruby/2.3.0/net/smtp.rb:551:in `do_start'
from /opt/gitlab/embedded/lib/ruby/2.3.0/net/smtp.rb:521:in `start'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/mail-2.7.0/lib/mail/network/delivery_methods/smtp.rb:109:in `start_smtp_session'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/mail-2.7.0/lib/mail/network/delivery_methods/smtp.rb:100:in `deliver!'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/mail-2.7.0/lib/mail/message.rb:2160:in `do_delivery'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/mail-2.7.0/lib/mail/message.rb:260:in `block in deliver'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/actionmailer-4.2.10/lib/action_mailer/base.rb:543:in `block in deliver_mail'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activesupport-4.2.10/lib/active_support/notifications.rb:164:in `block in instrument'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activesupport-4.2.10/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activesupport-4.2.10/lib/active_support/notifications.rb:164:in `instrument'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/actionmailer-4.2.10/lib/action_mailer/base.rb:541:in `deliver_mail'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/mail-2.7.0/lib/mail/message.rb:260:in `deliver'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/actionmailer-4.2.10/lib/action_mailer/message_delivery.rb:85:in `deliver_now'
from (irb):1
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.10/lib/rails/commands/console.rb:110:in `start'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.10/lib/rails/commands/console.rb:9:in `start'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.10/lib/rails/commands/commands_tasks.rb:68:in `console'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.10/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.10/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:14:in `require'
from bin/rails:14:in `<main>'
irb(main):002:0> exit
```
Also i have tested if the server can reach the SMTP server:
```
Starting Nmap 7.01 ( https://nmap.org ) at 2018-06-17 08:24 UTC
Nmap scan report for <domain> (<IPv4>)
Host is up (0.00076s latency).
rDNS record for <IPv4>: mail.<domain>
PORT STATE SERVICE
25/tcp open smtp
```
#### Results of GitLab environment info
<details>
<summary>Expand for output related to GitLab environment info</summary>
<pre>
System information
System: Ubuntu 16.04
Current User: git
Using RVM: no
Ruby Version: 2.3.7p456
Gem Version: 2.6.14
Bundler Version:1.13.7
Rake Version: 12.3.1
Redis Version: 3.2.11
Git Version: 2.16.4
Sidekiq Version:5.0.5
Go Version: unknown
GitLab information
Version: 10.8.4
Revision: 2268d0c
Directory: /opt/gitlab/embedded/service/gitlab-rails
DB Adapter: postgresql
URL: http://git.<domain>
HTTP Clone URL: http://git.<domain>/some-group/some-project.git
SSH Clone URL: git@git.<domain>:some-group/some-project.git
Using LDAP: no
Using Omniauth: no
GitLab Shell
Version: 7.1.2
Repository storage paths:
- default: /var/opt/gitlab/git-data/repositories
Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks
Git: /opt/gitlab/embedded/bin/git
</pre>
</details>
#### Results of GitLab application Check
<details>
<summary>Expand for output related to the GitLab application check</summary>
<pre>
(For installations with omnibus-gitlab package run and paste the output of:
```
`sudo gitlab-rake gitlab:check SANITIZE=true`)
(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true`)
(we will only investigate if the tests are passing)
``Checking GitLab Shell ...
GitLab Shell version >= 7.1.2 ? ... OK (7.1.2)
Repo base directory exists?
default... yes
Repo storage directories are symlinks?
default... no
Repo paths owned by git:root, or git:git?
default... yes
Repo paths access is drwxrws---?
default... yes
hooks directories in repos are links: ...
1/2 ... ok
1/3 ... ok
1/5 ... ok
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Check GitLab API access: OK
Redis available via internal API: OK
Access to /var/opt/gitlab/.ssh/authorized_keys: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Sidekiq ...
Running? ... yes
Number of Sidekiq processes ... 1
Checking Sidekiq ... Finished
Reply by email is disabled in config/gitlab.yml
Checking LDAP ...
LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... skipped (no tmp uploads folder yet)
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
1/2 ... yes
1/3 ... yes
1/5 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.5 ? ... yes (2.3.7)
Git version >= 2.9.5 ? ... yes (2.16.4)
Git user has default SSH configuration? ... yes
Active users: ... 1
Checking GitLab ... Finished
`
</pre>
</details>
### Possible fixes
I have tried everything i have found on web, but nothing worked.
issue