All performance and connectivity related data is fetched using a particular port called NCache Management Port. Default value of this port is 8250 but it is configurable using NCache Manager.
Using NCache Manager
Open NCache Manager.
Go to Tools menu option.
Select Options and a dialog box appear with Statistics, Management and Startup tabs. Go to the Management tab.
Type any value within your system’s port range and make sure that the port is free. Click OK.