{"id":6334,"date":"2021-04-22T14:04:02","date_gmt":"2021-04-22T08:34:02","guid":{"rendered":"https:\/\/www.skynats.com\/?p=6334"},"modified":"2025-10-28T11:25:08","modified_gmt":"2025-10-28T05:55:08","slug":"nagios-couldnt-bind-ldap-server-error","status":"publish","type":"post","link":"https:\/\/www.skynats.com\/blog\/nagios-couldnt-bind-ldap-server-error\/","title":{"rendered":"Nagios couldn\u2019t bind to the LDAP server error"},"content":{"rendered":"\n

Struck with error, thinking how to fix the \u2018could not bind to the LDAP server’ error in Nagios.<\/p>\n\n\n\n

Our technical team support will fix Nagios- related issues under our server management<\/span><\/a> plan. You can also take assistance from our technical team support 24\/7 for fixing the error or any sort of installation and migration<\/p>\n\n\n\n

Let’s have a glance at the causes.<\/p>\n\n\n\n

Why the error \u2018could not bind to the LDAP server\u2019 does occurs.<\/h2>\n\n\n\n

Let’s me take you to one of our client’s reports that he trying and executing the following.<\/p>\n\n\n\n

\/usr\/local\/nagios\/libexec\/check_ldaps -H dc01.domain.local -b \u201d -p 636<\/code><\/pre>\n\n\n\n
 Output<\/strong><\/p>\n\n\n\n
As a result, he got the following error.<\/p>\n\n\n\n
Could not bind to the LDAP server<\/p>\n\n\n\n
He tries to enable the verbose mode -v for the plugin:<\/p>\n\n\n\n
\/usr\/local\/nagios\/libexec\/check_ldaps -H dc01.domain.local -b \u201d -p 636 -v<\/p>\n\n\n\n
The following error displayed on the screen.<\/p>\n\n\n\n
ldap_bind: Can\u2019t contact LDAP server (-1)<\/code><\/pre>\n\n\n\n
additional info: TLS error -8179:Peer\u2019s Certificate issuer is not recognized.<\/p>\n\n\n\n
Could not bind to the LDAP server<\/h2>\n\n\n\n
This is due to plugins that don’t have a CA certificate to validate the certificate. By using the check_ldaps plugins let’s use the certificate authority (CA) certificates.<\/p>\n\n\n\n
Fixing the error<\/strong><\/p>\n\n\n\n
The check_ldap plugin makes use of OpenLDAP. Whereas the OpenLDAP package is installed defaulting as it’s a part of Nagios installation because the plugins have dependencies on them where it is left as a non-configured state.  <\/p>\n\n\n\n
In order to configure the OpenLDAP to use the certificate, you need to create the CA certificate on the Nagios server.<\/p>\n\n\n\n
we usually get the CA certificate from CA authorities and then tries to copy the content certificate into a file on the Nagios<\/a> XI server for this you need to open the SSH session.<\/p>\n\n\n\n
Create Certificate<\/strong><\/p>\n\n\n\n
Here, we will create a certificate file called \/etc\/openldap\/certs\/windows_ca.cer and this is from a Microsoft Windows server.<\/p>\n\n\n\n
 Execute command:<\/p>\n\n\n\n
vi \/etc\/openldap\/certs\/windows_ca.cer<\/code><\/pre>\n\n\n\n
Later, paste the content into SSH session. If all other blank lines are added then you request to delete all of these blank lines by simply pressing dd keyword.<\/p>\n\n\n\n
Then save the changes and close the file. <\/p>\n\n\n\n
Update ldap.conf<\/strong><\/p>\n\n\n\n
Making the OpenLDAP use the certificate.<\/p>\n\n\n\n
Execute the command.<\/p>\n\n\n\n
vi \/etc\/openldap\/ldap.conf<\/code><\/pre>\n\n\n\n
Open the file and drag it down to the end of the file.<\/p>\n\n\n\n
On a new line ,type and run the following:<\/p>\n\n\n\n
TLS_CACERT \/etc\/openldap\/certs\/windows_ca.cer<\/code><\/pre>\n\n\n\n
Save the required changes and close the file.<\/p>\n\n\n\n
Test Plugin<\/strong><\/p>\n\n\n\n
Now, the check_ldaps plugin should work:<\/p>\n\n\n\n
\/usr\/local\/nagios\/libexec\/check_ldaps -H dc01.domain.local -b \u201d -p 636<\/p>\n\n\n\n
If it works, the following message is produced:<\/p>\n\n\n\n
LDAP OK \u2013 0.043 seconds response time|time=0.042861s;;;0.000000<\/p>\n\n\n\n
Conclusion<\/strong><\/p>\n\n\n\n
In short, Follow the step to fix the \u2018could not bind to the LDAP server’ error in Nagios. If need any further assistance to fix the error – click here<\/span><\/a> and get help.<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Struck with error, thinking how to fix the \u2018could not bind to the LDAP server’ error in Nagios. Our technical team support will fix Nagios- related issues under our server management plan. You can also take assistance from our technical team support 24\/7 for fixing the error or any sort of installation and migration Let’s have a […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,309,213,68],"tags":[505,506,215],"class_list":["post-6334","post","type-post","status-publish","format-standard","hentry","category-blog","category-nagios","category-open-ldap-server","category-server-management","tag-could-not-bind-to-the-ldap-server-error-in-nagios","tag-nagios-couldnt-bind-to-the-ldap-server-error","tag-open-ldap-server"],"_links":{"self":[{"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/posts\/6334","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/comments?post=6334"}],"version-history":[{"count":1,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/posts\/6334\/revisions"}],"predecessor-version":[{"id":16389,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/posts\/6334\/revisions\/16389"}],"wp:attachment":[{"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/media?parent=6334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/categories?post=6334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/tags?post=6334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}