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Exit Codes and Statuses

MongoDB will return one of the following codes and statuses when exiting. Use this guide to interpret logs and when troubleshooting issues with mongod and mongos instances.

Code	Cause
`0`	Returned by MongoDB applications upon successful exit.
`1`	Returned by `mongod` as a generic failure when no other error codes apply.
`2`	The specified options are in error or are incompatible with other options.
`3`	Returned by `mongod` if there is a mismatch between hostnames specified on the command line and in the `local.sources` collection when running a replica set.
`4`	The version of the database is different from the version supported by the `mongod` (or `mongod.exe`) instance. The instance exits cleanly.
`5`	Returned by `mongos` if a problem is encountered during initialization.
`12`	Returned by the `mongod.exe` process on Windows when it receives a Control-C, Close, Break or Shutdown event.
`14`	Returned by MongoDB applications which encounter an unrecoverable error, an uncaught exception or uncaught signal. The system exits without performing a clean shutdown.
`20`	Message: `ERROR: wsastartup failed <reason>` Returned by MongoDB applications on Windows following an error in the WSAStartup function, used to initialize the networking subsystem. Message: `NT Service Error` Returned by MongoDB applications for Windows due to failures installing, starting or removing the NT Service for the application.
`48`	Returned by `mongod` or `mongos` when an error prevents a newly started instance from listening for incoming connections.
`50`	Returned by `mongod` during server initialization if it fails to fork the process.
`51`	Returned by `mongod` during server initialization if the daemon fails to send a ready signal. The process exits cleanly.
`61`	Returned by the Storage Node Watchdog if any of the filesystems with monitored directories are unresponsive.
`62`	Returned by `mongod` when the datafiles in `--dbpath` are incompatible with the version of `mongod` currently running. To resolve data incompatibility issues after upgrading, please refer to the release notes for your version of MongoDB and search for "Changes Affecting Compatibility."
`87`	Returned by `mongod` or `mongos` when the process health check triggers a crash.
`100`	Returned by `mongod` when the process throws an uncaught exception.
`102`	Returned by `mongod` or `mongos` when the process fails to rotate audit logs on startup.

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