What is Azure Active Directory Application Proxy?

Azure AD Application Proxy provides single sign-on (SSO) and secure remote access for web applications hosted on-premises.

Some apps you would want to publish include

1. SharePoint sites,

2. Outlook Web Access, or

3. any other LOB web applications you have.

These on-premises web applications are integrated with Azure AD, the same identity and control platform that is used by O365. End users can access your on-premises applications the same way they access O365 and other SaaS apps integrated with Azure AD. You don't need to change the network infrastructure or require VPN to provide this solution for your users.

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