We have several Windows servers using Attunity Server 5.3.2.50 to connect to OpenVMS.

The Windows programs connect with an embedded connection string:
Provider=ISG-OLEQP;Password="";User ID="";Data Source=SYS;Extended Properties="DSNPasswords=server1={username/password}";Operating_Mode="";Initial Catalog="";Strings As Unicode=False

which connects successfully with a supplied {username/password}

Looking at the settings on two of the Windows servers in Attunity Studio, they look identical i.e. all checkboxes for Anonymous access are checked. But one server will not connect unless a valid password is supplied and one will connect with any password.

My goal is to make both Windows servers require the correct password. Which setting should I set so that the second server will not connect unless a valid password is supplied?