Intermittent Cron Failures

Problem

The cron successfully finishes all of its tasks when you run it manually, but some cron job runs still do not succeed.

Cause

This type of issue may have many causes. You must perform additional investigation before you can determine next steps.

Troubleshooting

To troubleshoot this, log the output of the cron.php script to a file and then examine its contents.

The steps below do this on a cPanel & WHM server. For more information for other control panels, see your server’s documentation.

To investigate this issue on a cPanel & WHM server:

Enable Display Errors in the Other tab at Configuration () > System Settings > General Settings.
For more information, see Enable Error Reporting.
In cPanel, go to Advanced » Cron Jobs.
Click Edit for the cron job command that references the cron.php file.
For Command, append the following code to the end of the line:
```
-vvv >> crondebug.txt
```
Click Edit Line.
Wait until the Time of Day window has passed. For example, if the Time of Day setting is 1pm, wait until 2pm.
Open the crondebug.txt file in your account’s root directory. This file contains entries from each invocation of the cron.php script.

Review the file contents to locate the daily automation tasks. To find this, look for 24 or more tasks that queued for execution. For example:

An error occurring during execution:

WHMCS Automation Task Utility: all
==================================

Queuing Tasks
-------------

Applying "in progress" and "is due" state filters
Task queues ready

Executing Application Queue
---------------------------

Currency Exchange Rates

Product Pricing Updates

Tenant Usage Metrics

[ERROR] WHMCS\Exception\Module\NotServicable: Connection Error: Could not resolve host: fakeservertest(6) in /home/v80whmcssupport/public_html/whmcs/modules/servers/cpanel/cpanel.php:0

A successful execution:

WHMCS Automation Task Utility: all
==================================

Daily Cron Automation Mode

Queuing Tasks
-------------

Applying "in progress" and "is due" state filters
Task queues ready

Executing Application Queue
---------------------------


Currency Exchange Rates

Product Pricing Updates

Invoices

Late Fees

Credit Card Charges

Invoice & Overdue Reminders

Domain Renewal Notices

Cancellation Requests

Overdue Suspensions

Overdue Terminations

Fixed Term Terminations

Inactive Tickets

Delayed Affiliate Commissions

Email Marketer Rules

SSL Sync

Server Usage Stats

Client Status Update

Domain Expiry

Ticket Escalation Rules

Data Retention Pruning

WHMCS Updates

Run Jobs Queue



Sending Daily Cron Digest email

Executing System Queue
----------------------



[OK] Completed

Use the error that you find to determine the issue’s cause.

For more information, search for the specific error in our Troubleshooting documentation.
For additional help, contact WHMCS Technical Support. Include the full output from the steps above when you open your ticket.

Last modified: June 14, 2024