Couldn't reproduce this. Can you provide more info about your config file? Ex: Do you use custom configuration for publicurl?

I have not touched any config file. Besides, I would not know which file and what to do. Therefore, the answer is no. I don't use any custom configuration for publicurl. In the config.php file there is no 'publicurl' and in the config-defaults.php file, these are the lines under 'Advanced Setup':

// The public URL is the URL that is used for anything that is facing a survey participant.
// It can be used to have a separation / distinction between a public URL for surveys and a private one for
// the administration - for example for certain proxy configurations or internal/external domain separation
if (!isset($argv[0]) && Yii::app() != null) {
$config['publicurl'] = Yii::app()->baseUrl . '/'; // The public website location (url) of the public survey script
} else {
$config['publicurl'] = '/';
}

$config['assets'] = 'assets/';

// URL definitions
$config['homeurl'] = $config['publicurl'] . 'admin'; // The website location (url) of the admin scripts
$config['tempurl'] = $config['publicurl'] . 'tmp';
$config['imageurl'] = $config['publicurl'] . 'assets/images'; // Location of button bar files for admin script
$config['uploadurl'] = $config['publicurl'] . 'upload';
$config['standardthemerooturl'] = $config['publicurl'] . 'themes/survey'; // Location of the standard themes
$config['adminscripts'] = $config['publicurl'] . 'assets/scripts/admin/';
$config['generalscripts'] = $config['publicurl'] . 'assets/scripts/';
$config['packages'] = $config['publicurl'] . 'assets' . DIRECTORY_SEPARATOR . 'packages';
$config['vendor'] = $config['publicurl'] . 'vendor/';
$config['styleurl'] = $config['publicurl'] . 'themes/admin/';
$config['publicstyle'] = $config['publicurl'] . $config['assets'] . 'styles-public/';
$config['publicstyleurl'] = $config['publicstyle'];
$config['sCKEditorURL'] = $config['assets'] . 'ckeditor';
$config['userthemerooturl'] = $config['uploadurl'] . '/themes/survey'; // Location of the user themes
$config['adminimageurl'] = $config['styleurl'] . $config['admintheme'] . '/images/'; // Location of button bar files for admin script
$config['applicationurl'] = $config['publicurl'] . 'application/';
$config['extensionsurl'] = $config['applicationurl'] . 'extensions/';
$config['adminstyleurl'] = $config['styleurl'] . $config['admintheme'] . '/'; // Location of button bar files for admin script
$config['userfontsurl'] = $config['uploadurl'] . '/fonts'; // Location of user's fonts

I just found out that if i add "/index.php/" before the alias name in the URL, the URL works just fine!

More specifically, when I add an alias in "Survey alias:" field, the URL becomes "https://newsurveys.jour.auth.gr/alias" and then we get the "page not found" error. But, if I write the URL as "https://newsurveys.jour.auth.gr/index.php/alias", the error does not appear and the survey is launched. This must be a bug.

More specifically, when I add an alias in "Survey alias:" field, the URL becomes "https://newsurveys.jour.auth.gr/alias" and then we get the "page not found" error. But, if I write the URL as "https://newsurveys.jour.auth.gr/index.php/alias", the error does not appear and the survey is launched. This must be a bug.

The alias is made as to be as short as possible. so index.php is not expected.

Do you have a custom htaccess?
Is mod_rewrite enabled?

Thanks!

We have not made any changes to the htaccess file, whatsoever. All lines in this file have the default values since the installation.

I am sorry we can't reproduce it.
@tibor.pacalat can you?

Could there be an issue the fact that LimeSurvey is installed in a virtual machine?

I believe there is an issue with the htaccess. But just a guess

If so, is there any point in uploading here the htaccess file?