# Use the Logs

As Connector Framework Server runs, it outputs messages to log files. Most log messages occur due to normal operation, for example when CFS starts, receives actions, or processes documents. If CFS encounters an error, the logs are the first place to look for information to help troubleshoot the problem.

CFS separates log messages into the following message types, each of which relates to a specific feature:

Log Message Type | Description
--- | ---
`Action` | Logs actions that are received by CFS, and related messages.
`Application` | Logs application-related occurrences, such as when the CFS starts.
`Import` | Information about the import process. When you set `LogLevel` to `FULL`, CFS can log a significant amount of information about the import process, which might reduce performance.
`Indexer` | Information about the indexing process.

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