I have been helping a customer evaluate the auditing capabilities of MongoDB Enterprise. In their config file, they had an auditFilter parameter specified like:

auditFilter='{atype:{$in:["authCheck"]}, "param.command":{$in:["read"]}}'  

With this line in the config file, MongoDB fails to start and no error message is printed to the log file. Removing the outside '' as shown below resolves the problem, but mongod should print out an error message or something to the log file.

auditFilter={atype:{$in:["authCheck"]}, "param.command":{$in:["read"]}}

I have attached the complete mongod.conf file I used to recreate the problem.