mongodb 3.0 C#连接认证错误

错误日志:
2015-08-21T18:26:01.919+0800 I ACCESS   [conn5074]  authenticate db: mg_zhaopiao_log { authenticate: 1, user: "zptest", nonce: "xxx", key: "xxx" }
2015-08-21T18:26:01.919+0800 I ACCESS   [conn5074] Failed to authenticate zptest@mg_zhaopiao_log with mechanism MONGODB-CR: AuthenticationFailed MONGODB-CR credentials missing in the user document



---修改版本
use admin

var schema = db.system.version.findOne({"_id" : "authSchema"})
schema.currentVersion = 3
db.system.version.save(schema)


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


use mg_zhaopiao_log;
db.dropUser("zpmg")


--新建对应用户即可