@eGs
It looks like you missed some steps and prerequisites before installing ambari. 127.0.0.1 should not be used to access the UI. Ambari docs require use to use FQDNs for all nodes and hosts.
Additionally, the 403 error above is result from using versions of ambari/hdp which cloudera has moved behind a paywall. User/password is required to access these assets now.
You should try with Ambari 2.7.4 and repos and artifacts that are not behind a paywall.
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