What causes "Request-URI Too Long" error in Nagios?

[TeetharKehar]

We're facing an error while trying to deploy 3 dashboards to our 561 internal users. When we choose the dashboards and users, we encounter the following message:

"Request-URI Too Long
The requested URL's length exceeds the capacity limit for this server."

Our system is Nagios Fusion 4.1.9 running on a RHEL 7 VM.

[TeetharKehar]

The error you're encountering while deploying dashboards to your internal users is related to the length of the requested URL, which exceeds the server's capacity limit. This issue can be resolved by adjusting the server configuration to accommodate longer URLs.

Since you're using Nagios Fusion 4.1.9 on a RHEL 7 VM, here are the steps you can follow:

Locate the server configuration file for your Nagios Fusion installation. Typically, this file is named httpd.conf or apache2.conf and is located in the /etc/httpd/ or /etc/apache2/ directory.

Open the configuration file using a text editor with administrative privileges.

Look for the directive LimitRequestLine or LimitRequestFieldSize in the configuration file. This directive sets the maximum length for an HTTP request.

Increase the value of LimitRequestLine or LimitRequestFieldSize to a higher number that can accommodate the longer URLs required for your dashboards. For example, you can set it to LimitRequestLine 8192 to allow for an 8KB request.

Save the changes to the configuration file and restart the Nagios Fusion service for the changes to take effect.

After applying these changes, you should be able to deploy the dashboards to your 561 internal users without encountering the "Request-URI Too Long" error. Remember to monitor the server's performance to ensure it can handle the increased request size.

If you continue to experience issues or need further assistance, please provide more details about your setup, such as the web server version and any relevant error logs, to help troubleshoot the problem more effectively.

[brendagray]

The error message you are encountering, "Request-URI Too Long," suggests that the URL length exceeds the capacity limit of the server when trying to deploy the dashboards to your internal users. This issue is typically related to the HTTP GET request reaching its maximum allowed length.

To address this problem, you can try the following solutions:

Shorten the URL: Reduce the length of the URL by removing any unnecessary parameters, query strings, or other components. Simplifying the URL may help it fit within the server's capacity limits.

Use HTTP POST: Instead of using the GET method to deploy the dashboards, consider using the POST method. POST requests have a higher capacity limit for data and can handle larger payloads. Modifying the deployment process to use POST requests instead of GET requests might resolve the issue.

Configure server settings: Check if there are any server settings related to URL length restrictions. For example, in Apache HTTP Server, you can adjust the LimitRequestLine directive in the server configuration file (e.g., httpd.conf) to increase the allowed URL length. Consult the documentation for your specific server software to find the relevant configuration options.

Split the deployment: If reducing the URL length or modifying server settings is not feasible, you can divide the deployment into smaller batches. Instead of deploying all dashboards to all 561 users simultaneously, try deploying them in smaller groups or subsets. This approach reduces the length of the URL for each deployment, avoiding the capacity limitation.

Remember to test and validate any changes made to ensure they do not cause unexpected issues or compromise the stability of your Nagios Fusion system.