I have a code at home, but basically what I do is following :
I authenticate my user on my server running blazeds, which
returns user role etc .. then I call Java class(one that comes with
SDK) to generate signed and encrypted string ..(for now class has
my info hardcoded: url, , room name etc ... ) then I take that
string and pass it to authenticator and that authenticator is set
under conSeasson property "authenticator"
and finally I initiate login() and I get that instance error
in debug version of FP10.
I did turn on debug for java class and all responses from
serve seemed fine, did not really see any 404 errors, I will double
check again today, but what I was rally thinking was if server
could return more detail error message to display to user instead
of INVALID_INSTANCE: Invalid Instance ,