Exit Codes and Statuses

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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.
`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, in master/slave mode.
`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`	A newly started `mongod` or `mongos` could not start listening for incoming connections, due to an error.
`61`	Returned by the Storage Node Watchdog if any of the filesystems with monitored directories are unresponsive.
`62`	Returned by `mongod` if the datafiles in `--dbpath` are incompatible with the version of `mongod` currently running.
`100`	Returned by `mongod` when the process throws an uncaught exception.

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Error Codes

Glossary