Java cannot connect MongoDB problem __java

Background information:

Because the Linux server used for development is in a relatively closed environment, only 22 ports are accessed via SSH. So I used putty to do an SSH forwarding to map the 27018 port of this machine to the remote 27017 port. Successfully connected via MONGO localhost:27018 in CMD and operated.

Phenomenon:

In the program through the

Mongo Mongo = new Mongo ("localhost", 27018);

MongoDB on a remote server, the following error occurred while the program was running:

caused By:java.io.IOException:couldn ' t connect to [3cnl07745/172.28.220.64:27018] Bc:java.net.ConnectException: Connection Refused:connect at
	Com.mongodb.dbport._open (dbport.java:206) at
	Com.mongodb.DBPort.go ( dbport.java:94) at
	com.mongodb.DBPort.go (dbport.java:75) at
	Com.mongodb.DBPort.call (dbport.java:65)
	At Com.mongodb.DBTCPConnector.call (dbtcpconnector.java:207) ...
	Panax Notoginseng

As seen from the exception information, localhost is replaced with a "machine name/IP address", which is not connected in CMD.

Workaround:

In fact, the solution is quite simple: replace the localhost to become 127.0.0.1 .