mongodb - 指定的参数已超出有效值的范围

Question

Error encountered
Unable to connect to server 127.0.0.1:-1: 指定的参数已超出有效值的范围。
参数名: port.
Type: MongoDB.Driver.MongoConnectionException
Stack: 在 MangoUI.ComServerView.RefreshDBs(MMongo mc, TimeSpan& data, TimeSpan& gui, Boolean throwEx)
在 MangoUI.ComServerView.RenderMe()
这里的端口号配置的是如下，按照道理来说应该没有什么问题：

每一次test，都是报出这样的错误。

Answer 1

The problem is solved, because there is no username and password, there is no need to enter any username and password

Answer 2

Unable to connect to server 127.0.0.1:-1

How can the port number be -1? Check your program/configuration file or something.