Login page timeout

[j.cat]

after a fresh reinstall i got this issue, login through web page, using only ip address, results in a timeout.
If i add a url after the ip the login page open immediately.

i.e.
192.168.0.1                    fails
192.168.0.1/index.php    works
192.168.0.1/azcxxz  also works!

any idea?