Debugging ColdFusion Scheduled Tasks That Silently Fail With No Log Output

When a ColdFusion scheduled task silently fails — the Administrator shows it configured, the scheduler log may even show it “completed,” but no template actually ran, no output generated, no records updated — the root cause is almost always one of a handful of things, and the silence comes from the scheduler’s HTTP-request execution model. ColdFusion runs a scheduled task by making an HTTP request to a URL, so the task depends on the network stack, web server bindings, DNS, SSL trust, authentication, and firewall all working — and when any of those break, the request never reaches your CFML, so your code’s logging never runs. The other silent-failure source is inside the task template: an unhandled exception (often accessing application-scoped variables that aren't initialized in a scheduler request) that fails without surfacing. The fix is systematic: verify the scheduler and service are running, test the task URL outside ColdFusion with curl, add your own logging inside the template with try/catch, check for SSL/PKIX and authentication/redirect problems, confirm the service account's file permissions, and validate neo-cron.xml. This guide is the full debugging playbook.
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