Error 500 with LDAP login

Hi, I am trying to set up gitlab to work with our active directory
When I try to login using active directory credentials I get the error

500
Whoops, something went wrong on our end.
Try refreshing the page, or going back and attempting the action again.

Please contact your GitLab administrator if this problem persists.

If I run gitlab-rake gitlab:ldap:check --trace I get the following error

[root@s-gitlab ~]# gitlab-rake gitlab:ldap:check --trace
** Invoke gitlab:ldap:check (first_time)
** Invoke gitlab_environment (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute gitlab_environment
** Execute gitlab:ldap:check
Checking LDAP ...

Server: ldapmain
rake aborted!
Net::LDAP::Error: Connection reset by peer - SSL_connect
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/net-ldap-0.16.0/lib/net/ldap/connection.rb:72:in `open_connection'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/net-ldap-0.16.0/lib/net/ldap/connection.rb:698:in `socket'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/net-ldap-0.16.0/lib/net/ldap.rb:1321:in `new_connection'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/net-ldap-0.16.0/lib/net/ldap.rb:713:in `block in open'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/net-ldap-0.16.0/lib/net/ldap/instrumentation.rb:19:in `instrument'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/net-ldap-0.16.0/lib/net/ldap.rb:711:in `open'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/net-ldap-0.16.0/lib/net/ldap.rb:644:in `open'
/opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/auth/ldap/adapter.rb:13:in `open'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/check.rake:358:in `block in check_ldap'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/check.rake:354:in `each'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/check.rake:354:in `check_ldap'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/check.rake:343:in `block (3 levels) in <top (required)>'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `block in execute'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `each'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `execute'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/task.rb:213:in `block in invoke_with_call_chain'
/opt/gitlab/embedded/lib/ruby/2.4.0/monitor.rb:214:in `mon_synchronize'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/task.rb:193:in `invoke_with_call_chain'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/task.rb:182:in `invoke'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:160:in `invoke_task'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `each'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `block in top_level'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:125:in `run_with_threads'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:110:in `top_level'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:83:in `block in run'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:186:in `standard_exception_handling'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/lib/rake/application.rb:80:in `run'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/opt/gitlab/embedded/bin/rake:23:in `load'
/opt/gitlab/embedded/bin/rake:23:in `<top (required)>'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:74:in `load'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:74:in `kernel_load'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:28:in `run'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/cli.rb:424:in `exec'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/cli.rb:27:in `dispatch'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/cli.rb:18:in `start'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/exe/bundle:30:in `block in <top (required)>'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
/opt/gitlab/embedded/lib/ruby/gems/2.4.0/gems/bundler-1.16.2/exe/bundle:22:in `<top (required)>'
/opt/gitlab/embedded/bin/bundle:23:in `load'
/opt/gitlab/embedded/bin/bundle:23:in `<main>'
Tasks: TOP => gitlab:ldap:check

My sanitized gitlab.rb looks as follows

gitlab_rails['ldap_enabled'] = true
gitlab_rails['ldap_servers'] = {
'main' => {
  'label' => 'AD NAME',
  'host' => 'IP ADDRESS',
  'post' => 636,
  'uid' => 'sAMAccountName',
  'encryption' => 'simple_tls',
  'verify_certificates' => false,
  'bind_dn' => 'CN=USER,OU=STUFF,DC=STUFF,DC=STUFF,DC=STUFF,DC=STUFF',
  'password' => 'PASSWORD',
  'active_directory' => true,
  'base' => 'OU=STUFF,DC=STUFF,DC=STUFF,DC=STUFF,DC=STUFF',
  }
}

Any advice on how to fix this? I found the following from 2015 LDAPS to AD connection reset but was unsure if it was the right process for my issue.

Any advice?