Mongo authentication failed

  mongodb, question

2016-11-09T21:44:08.312+0800 I ACCESS [conn2] SCRAM-SHA-1 authentication failed for on mytestdatabase from client 127.0.0.1 ; BadValue: Incorrect SCRAM-SHA-1 user name: n=

2016-11-09T21:44:08.779+0800 I NETWORK [conn2] end connection 127.0.0.1:51739 (1 connection now open)
2016-11-09T21:44:08.779+0800 I NETWORK [conn1] end connection 127.0.0.1:51737 (1 connection now open)

mac osx 10.10.5

mongodb-osx-x86_64-3.2.4

mongo-java-driver-2.13.1

Use nutch to perform the first task InjectorJob

The above is the wrong information, what is the reason?

I also met the problem of SCRAM-SHA-1 today.
It is suggested to reduce the version of accreditation mechanism.
SCRAM-SHA1 authentication mechanism used in MongoDB

If the client does not have the SCRAM-SHA-1 verification method, it can choose to lower the authverison version. This authentication method is not used, and the default authentication method needs to be manually modified when the tool is connected.

db.getCollection('system.version').find({})
{
 "_id" : "authSchema",
 "currentVersion" : 3
 }