use your debugger and trace the events that lead up to the redirection and the redirection its' self.
Or, if you don't have/don't know how to use a debugger then use echo, var_dump($variable_property_or_object) and find out if http error codes are being suppressed or written to a log instead of the screen. within the redirectorl. If this checksout then...
Check you apache or IIS logs. Rather than do an exhaustive search of these, Run your application so to trigger an error and then check the logs close to the same time where this is done. You will see server errors their.
its just because of an ACCESS POINT error. If you connect via a Mobile device, Try disconnect it and have a look for the Configuration settings. Change it to NETCONNECT rather than having it with some other options. If you connect via a Wired connection, Try connect after deleting all the cookies, history and everything. I hope this info will be useful to You. Write back if you got any issues further. Tc.