Sorry, I've stopped the apache server for a while, but I'm not getting incorrect password, it keeps loading till I get this message at google chrome:
this web page is not available
ERR_CONNECTION_RESET
like if it were trying to connect to some place (it takes about 30 seconds before I get that error message on the browser)

and on the error log I'm getting this:

[Tue Dec 08 01:34:41.971502 2015] [mpm_prefork:notice] [pid 3065] AH00169: caught SIGTERM, shutting down
[Tue Dec 08 01:34:43.070374 2015] [mpm_prefork:notice] [pid 3146] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.14 configured -- resuming normal operations
[Tue Dec 08 01:34:43.070436 2015] [core:notice] [pid 3146] AH00094: Command line: '/usr/sbin/apache2'
dennisbot@DOMJUDGE:/var/log/apache2$ ls -l
total 140
-rw-r----- 1 root adm 128189 dic  8 01:35 access.log
-rw-r----- 1 root adm   4414 dic  8 01:34 error.log

i think the timeout of php make restart apache but I'm wondering why it's not posting the admin/admin credential, hope you can help me.

PD: the URL on question is this: http://isc.unsaac.edu.pe/cuscontest/public/login.php

Dennis