LDAP ConnectionRefusedError (while disabled)

Summary

Although we disabled LDAP (and never used it before) we receive Sentry errors from Sidekiq (the ldap_group_sync queue).

Steps to reproduce

Running GitLab EE with LDAP disabled.

(this bug happened before v9.3.1-ee)

What is the current bug behavior?

In our Sentry endpoint we receive errors like:

Net::LDAP::ConnectionRefusedError: Connection refused - connect(2) for "" port 389

For details see https://sentry.io/share/issue/38343230342e333031363938343534/

The first occurrence of this error happend when upgrading from v8.15.4-ee to v8.16.3-ee according to Sentry. Details: https://sentry.io/share/issue/38343230342e323131353337313237/

What is the expected correct behavior?

When LDAP is disabled this queue should never run.

Relevant logs and/or screenshots

https://sentry.io/share/issue/38343230342e333031363938343534/

Results of GitLab environment info

Expand for output related to GitLab environment info 
WARNING: This version of GitLab depends on gitlab-shell 5.0.5, but you're running 5.0.4. Please update gitlab-shell.


System information
System:		Ubuntu 14.04
Proxy:		no
Current User:	git
Using RVM:	no
Ruby Version:	2.3.4p301
Gem Version:	2.5.2
Bundler Version:1.15.1
Rake Version:	10.5.0
Redis Version:	2.8.4
Git Version:	2.13.0
Sidekiq Version:5.0.0
Go Version:	unknown


GitLab information
Version:	9.3.1-ee
Revision:	a15332b
Directory:	/home/git/gitlab
DB Adapter:	postgresql
DB Version:	9.6.1
URL:		https://gitlab.example.com
HTTP Clone URL:	https://gitlab.example.com/some-group/some-project.git
SSH Clone URL:	git@git.example.com:some-group/some-project.git
Elasticsearch:	no
Geo:		no
Using LDAP:	no
Using Omniauth:	no


GitLab Shell
Version:	5.0.4
Repository storage paths:
  • default: /home/git/data/repositories Hooks: /home/git/gitlab-shell/hooks Git: /usr/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check 
WARNING: This version of GitLab depends on gitlab-shell 5.0.5, but you're running 5.0.4. Please update gitlab-shell.
Checking GitLab Shell ...

GitLab Shell version >= 5.0.5 ? ... FAIL. Please update gitlab-shell to 5.0.5 from 5.0.4
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: ...
25/1 ... ok
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Running /home/git/gitlab-shell/bin/check
Check GitLab API access: OK
Access to /home/git/.ssh/authorized_keys: OK
Send ping to redis server: OK
gitlab-shell self-check successful


Checking GitLab Shell ... Finished


Checking Sidekiq ...


Running? ... yes
Number of Sidekiq processes ... 1


Checking Sidekiq ... Finished


Checking Reply by email ...


Reply by email is disabled in config/gitlab.yml


Checking Reply by email ... Finished


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? ... yes
Init script exists? ... yes
Init script up-to-date? ... yes
Projects have namespace: ...
25/1 ... yes
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Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.3 ? ... yes (2.3.4)
Git version >= 2.7.3 ? ... yes (2.13.0)
Active users: ... 9
Elasticsearch version 5.1 - 5.3? ... skipped (elasticsearch is disabled)


Checking GitLab ... Finished