On premise Sharepoint external sharing

Hello, we're running SharePoint 2013 on premises and when trying to share a site with an external party, we get this message:

"Sorry, you are not allowed to share this with external users"

I know there is a way to share in Office 365 but I'm not sure if that options exists for On-premises SharePoint.

Thank you
Alan DalaITAsked:
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Rainer JeschorCommented:
this option exists, the issue is related to have a proper configuration for ADFS / forms based ....
How should the external user authenticate?

What kind of authentication is your current web application using? Windows (NTLM or Kerberos)? Claims based?

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