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LDAPS authentication ignores custom port setting #3713

ignasr opened this issue Mar 8, 2019 · 1 comment


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commented Mar 8, 2019

Expected Behavior

LDAP resource with LDAPS encryption uses the port that is configured in the 'Port' field.

Current Behavior

Because of how ldap_connect() works, the port used is always 636 (and the configured port is ignored). See "elsint at yahoo dot com" comment on

Possible Solution

When LDAPS is used, the $hostname must be concatenated with $port. The line

$hostname = 'ldaps://' . $hostname;

should be changed to
$hostname = 'ldaps://' . $hostname . ':' . $this->port;

Steps to Reproduce (for bugs)

  1. in the icingaweb2 GUI, create a new LDAP resource, choose LDAPS and random server ( and radom port (8888) and random pw as connection parameters
  2. on the icingaweb2 instance start tcpdump with tcpdump -i any host -nn
  3. click "Validate configuration" and watch how tcpdump logs this (notice the wrong port)
16:52.100727 IP 10.xx..xx.xx.38266 > Flags [S], seq 2868288110, win 26883, options [mss 8961,sackOK,TS val 1034756882 ecr 0,nop,wscale 7], length 0

although this is (wrongly) logged by icingaweb2:

Mar 08 18:16:57 host icingaweb2[28849]: LDAP bind (uid=xxx / ***) to with default port 8888 failed: Can't contact LDAP server

After the code change the connection looks and works like expected:

18:29:48.853087 IP 10.xx.xx.xx.60032 > Flags [S], seq 4193613384, win 26883, options [mss 8961,sackOK,TS val 1035533634 ecr 0,nop,wscale 7], length 0


This ticket is similar but it seems it did not fix the problem: #2812

Your Environment

  • Icinga Web 2 version and modules (System - About):
    Icinga Web 2 Version 2.6.2
    Git commit 63cb9d7
    Git commit date 2018-11-21
  • Operating System and version: Centos 7
  • PHP:
    [root@host ~]# /opt/rh/rh-php71/root/usr/bin/php --version
    PHP 7.1.8 (cli) (built: Aug 9 2017 13:20:06) ( NTS )

ignasr added a commit to ignasr/icingaweb2 that referenced this issue Mar 8, 2019


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commented Apr 5, 2019

Hi, thanks for reporting this!

That's even documented: The port to connect to. Not used when using LDAP URIs. Which is forced since 1b440a4 🤦‍♂

@nilmerg nilmerg added this to the 2.7.0 milestone Apr 5, 2019

@lippserd lippserd modified the milestones: 2.7.0, 2.6.3 Apr 8, 2019

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