Error seems pretty clear. The file is not open on the server and thus your client cannot open it. You'll need to either change the setting or give the file a password.
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The setting that philmodjunk mentions is the one where FMS15 by default does not allow files to be hosted if there is no pw set for the full access account.
If you really want you can turn that setting off (but it is highly recommended to not do that): FMS admin console > Database Server > Security tab, all the way at the bottom.
But it is much better to give your full access account a strong pw.