Opc da configuration error

Hi Everyone
I am trying to connect OPC-DA server to node-red by using OPC-DA client node, but it gives access denied error. In our OPC-DA server no user name and password configuration required it directly connected to another OPC-DA client application but when we try it to connect with node-red opc-da node then user name and password required So The question is, what I have to set for Username and password.
Currently I added my system username and password.
Please see attached screenshot for your reference