I am facing an "Unaccessible SAP Instance" error while trying to add an SAP System in NWDS

Hello Guys,

When I am trying to add SAP System in SAP AS JAVA. It is throwing an error and below is screenshot for the error.

Can anyone help me to resolve the issue.

NWDS Version: 7.3

Portal : 7.4

Java: 1.6.45

Can firewall be the reason for this error?

Regards,

Aswin