An application repeatedly logged a Dubbo RemotingException whose deepest cause was Connection refused. The stack trace included business interfaces, proxy classes, and retry workers, which made request parameters and client code look like plausible starting points.

The transport error was much more …

A local WMS instance had a JDBC configuration that clearly targeted a test database, yet its users, permissions, and parts of its UI behaved as if they came from another environment. Looking at one configuration file made it tempting to conclude that the application had silently switched databases. …