I have been connecting to the FMS17 Admin API - I had some problems (error 1631) so I changed the password a few times until I found one that worked. It seems like the password should not start with a number. I have read that spaces in the user name may cause issues. In any case it is possible to have a username and password that works fine for the web-based admin console but not for the Admin API. Are the requirements/specifications/limitations for the admin username & password for the Admin API documented somewhere?
How about for the Data API - I am guessing they'll be the same specification?