luceos I'm so [removed] idiot!!!!! SOLVED
I had defined a wrong port in one place at my config. Thank you so much!!
I was ofusque about "varnish", but that was not the problem. A mistake in the apache configuration was redirecting to :80 port.
You make me think about it and finally we solve it.
Now I'm installing FLARUM with Composer with one error. I go to paste here but the most probably I can solve these dependencies by myself, but if someone want to help::
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symfony/console suggests installing symfony/event-dispatcher ()
filp/whoops suggests installing symfony/var-dumper (Pretty print complex values better with var-dumper available)
filp/whoops suggests installing whoops/soap (Formats errors as SOAP responses)
paragonie/random_compat suggests installing ext-libsodium (Provides a modern crypto API that can be used to generate random bytes.)
illuminate/support suggests installing jeremeamia/superclosure (Required to be able to serialize closures (~2.0).)
illuminate/support suggests installing symfony/var-dumper (Improves the dd function (2.7.).)
symfony/translation suggests installing symfony/config ()
illuminate/cache suggests installing illuminate/redis (Required to use the redis cache driver (5.1.).)
illuminate/filesystem suggests installing league/flysystem-aws-s3-v3 (Required to use the Flysystem S3 driver (~1.0).)
illuminate/filesystem suggests installing league/flysystem-rackspace (Required to use the Flysystem Rackspace driver (~1.0). )
illuminate/database suggests installing fzaninotto/faker (Required to use the eloquent factory builder (~1.4).)
illuminate/database suggests installing illuminate/console (Required to use the database commands (5.1.).)
illuminate/database suggests installing illuminate/pagination (Required to paginate the result set (5.1.).)
illuminate/mail suggests installing aws/aws-sdk-php (Required to use the SES mail driver (~3.0).)
illuminate/mail suggests installing jeremeamia/superclosure (Required to be able to serialize closures (~2.0).)
intervention/image suggests installing intervention/imagecache (Caching extension for the Intervention Image library)
league/flysystem suggests installing league/flysystem-aws-s3-v2 (Allows you to use S3 storage with AWS SDK v2)
league/flysystem suggests installing league/flysystem-aws-s3-v3 (Allows you to use S3 storage with AWS SDK v3)
league/flysystem suggests installing league/flysystem-azure (Allows you to use Windows Azure Blob storage)
league/flysystem suggests installing league/flysystem-cached-adapter (Flysystem adapter decorator for metadata caching)
league/flysystem suggests installing league/flysystem-eventable-filesystem (Allows you to use EventableFilesystem)
league/flysystem suggests installing league/flysystem-rackspace (Allows you to use Rackspace Cloud Files)
league/flysystem suggests installing league/flysystem-sftp (Allows you to use SFTP server storage via phpseclib)
league/flysystem suggests installing league/flysystem-webdav (Allows you to use WebDAV storage)
league/flysystem suggests installing league/flysystem-ziparchive (Allows you to use ZipArchive adapter)
league/flysystem suggests installing spatie/flysystem-dropbox (Allows you to use Dropbox storage)
league/flysystem suggests installing srmklive/flysystem-dropbox-v2 (Allows you to use Dropbox storage for PHP 5 applications )
matthiasmullie/minify suggests installing psr/cache-implementation (Cache implementation to use with Minify::cache)
monolog/monolog suggests installing aws/aws-sdk-php (Allow sending log messages to AWS services like DynamoDB)
monolog/monolog suggests installing doctrine/couchdb (Allow sending log messages to a CouchDB server)
monolog/monolog suggests installing ext-amqp (Allow sending log messages to an AMQP server (1.0+ required))
monolog/monolog suggests installing ext-mongo (Allow sending log messages to a MongoDB server)
monolog/monolog suggests installing graylog2/gelf-php (Allow sending log messages to a GrayLog2 server)
monolog/monolog suggests installing mongodb/mongodb (Allow sending log messages to a MongoDB server via PHP Driver)
monolog/monolog suggests installing php-amqplib/php-amqplib (Allow sending log messages to an AMQP server using php-amqplib)
monolog/monolog suggests installing php-console/php-console (Allow sending log messages to Google Chrome)
monolog/monolog suggests installing rollbar/rollbar (Allow sending log messages to Rollbar)
monolog/monolog suggests installing ruflin/elastica (Allow sending log messages to an Elastic Search server)
monolog/monolog suggests installing sentry/sentry (Allow sending log messages to a Sentry server)
Package http-interop/http-middleware is abandoned, you should avoid using it. Use http-interop/http-server-middleware instea d.
Writing lock file
Generating autoload files
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