Urgent! SDM can't logon

Hello guys,

I started the SDM GUI with RemoteGui.sh , then I click the "connect" button , and enter the password "sap2cool".

It display that "ERROR: Could not establish connection to server XCPRD01 at port 50118: A remote host refused an attempted connect operation."

I am sure the password is correct, because I had updated the password with Visual admin,

also Security Store of configtool.And I had restart the server.

And the Systeminformation display that PID: (blank), SDM Port null.

I had check the property file of SDM , workingport is 50118 .

Is there any suggestions?

BR,

Jianguo Chen