The specified parameter is outside the range of valid values

  mongodb, question

Error encountered
Unable to connect to server127.0.0.1:-1: the specified parameter is outside the range of valid values.
Parameter name: port.
Type: MongoDB.Driver.MongoConnectionException
Stack: at mangoui.comserverwiew.refreshdbs (mmogomc, timespan & data, timespan & gui, boolean throwex)
At MangoUI.ComServerView.RenderMe ()
The port numbers here are configured as follows, so there should be no problem in principle:
图片描述
Every test reports such an error.

The problem is solved, because there is no user name and password, so there is no need to enter any user name and password.