Nagios XI - Hosts Pending/Gray

Problem Description

Your host objects (or services) are in a Pending state and they appear gray in color.

Explanation

This problem can occur when the host or service object does not have a check command assigned to it.

Resolving The Problem

Add a valid check command to the host or service object.

This example will focus on defining a check command on the localhost host object.

From the Configure menu click Core Configuration Manager (CCM)

Under Monitoring click Hosts

Click the host localhost

Select the Check command check_xi_host_ping

Populate the argument fields with the following values:

$ARG1$ = 3000.0

$ARG2$ = 80%

$ARG3$ = 5000.0

$ARG4$ = 100%

Click Save

Click Apply Configuration

Now the local host will have a valid check to execute.

Other Problems

This issue can occur as a side affect of other problems on the Nagios XI server. The following is a summary of those issues and links to supporting documentation.

Active Checks Disabled
- Make sure that Active Checks are enabled
  - Globally = Admin > System Information > Monitoring Engine Status
  - Per Host / Service = Status Details Page > Advanced tab > Service Attributes
Database Problems
- A crashed or corrupted database can cause unexpected issues
  - https://support.nagios.com/kb/article.php?id=24
- An incorrectly offloaded database
  - https://assets.nagios.com/downloads/nagiosxi/docs/Offloading_MySQL_to_Remote%20Server.pdf
retention.dat File
- https://support.nagios.com/kb/article.php?id=522
Security-Enhanced Linux (SELinux)
- SELinux is not supported by Nagios XI, if it is please disabled using the steps in this KB article:
  - https://support.nagios.com/kb/article.php?id=25
SSL/TLS Certificate Issues
- Incorrectly configured SSL/TLS certificates can cause unexpected issues
  - https://assets.nagios.com/downloads/nagiosxi/docs/Configuring-SSL-with-Nagios%20XI.pdf

Final Thoughts

For any support related questions please visit the Nagios Support Forums at:

http://support.nagios.com/forum/