15.30Startup failure vs runtime failure

Different categories.

Startup

Application never reaches RUNNING.

Think:

bad config
missing secret
connector initialization
runtime incompatibility
invalid Mule configuration
dependency problem
port/config problem

Runtime

Application starts fine, then requests fail.

Think:

Salesforce down
bad data
credential expiration
rate limits
timeouts
unexpected payload
memory pressure

Different troubleshooting path.