I have an Edit Feature Service that i tried to synchronize in my offline app. But when i do it, i got a screen like this in attachment and when i access the service from browser, it don't happen.
I created the same service in another server and i don't have the same "problem".
What i have to do to avoid that credentials screen in my app.
Thankyou for everyone.
Looks like the service that you are using is secured and you haven't signed in in the application before synchronization call. My guess is that you have cached credentials in the browser so it wont ask it.