I have not seen any issue with a sign in form popping up.
- Did you make sure to add the --regsuppress=ss parameter when you generated your prov.xml file?
- Did you create the application.xml.override file and save it in both locations as documented here?
One more thing I should mention: make sure that if you are copying and pasting any commands from this thread that the quotation marks (") haven't gotten converted to typographic quotes (”). Particularly, this has happened in the comment from Romsinha above.