Hi Adriano,
I've seen that you use an invalid certificate in your site (not trusted). That's going to cause problems in Android, in some Android versions you won't be able to login in your site because the certificate won't be accepted.
Also, I tried to login using the credentials you provided but I get an error, seems the user or password is wrong.
Even if they're wrong, I'm editing your post to hide the credentials, it's not safe to make them public
Kind regards,
Dani