An unhandled exception of type 'SAP.Middleware.Connector.RfcCommunicationException' occurred in sapnco.dll

An unhandled exception of type 'SAP.Middleware.Connector.RfcCommunicationException' occurred in sapnco.dll
Additional information:
LOCATION    CPIC (TCP/IP) on local host with Unicode
ERROR       partner 'ipaddress' not reached

It shows the error you are getting just because of  you have entered wrong ip address in  sap connection with asp.net .
sometimes  we use web service to connect sap but sometimes just dll files at that time data you providing like ..
ip address , uname and password then you need to add correct information else you will get error  like that.

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