Already tried this with no success. Now I have reset the iOS device to factory settings and just installed CWS. Still the same. I can create the site. but after entering login credentials I get prompted again for credentials but without credential fields (see picture in my original post). I can only press "Connect" and returns with "Connection failed. InternalError".
I still own an iPhone 4 with iOS 7. Tried on this one with strange behavior as well: Site creation ok. When I provide credentials and connect, I am prompted again to enter Password twice (see attached screenshot). After this CWS is working properly.
So I assume it's not the app or iOS causing this issue. But on Smart Console I couldn't find any corresponding log entry. Any idea where to search or which search pattern or query to use?
Thanks.