You have to ensure that NWFTPD.NLM is loaded, don't think any other configuration is required. To test this, load the NLM on the server and from your workstation, see if you can attach via FTP.
Run a command prompt and run FTP.EXE. Type OPEN SERVER where SERVER is the name of your fileserver. When it prompts you for a username, type in the full login name and context (eg. MYNAME.CONTEXT.ORGANIZATION) and then the password when prompted.
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