Azure Web App authenticate with on-premise Active Directory

Currently I have on-premise IIS Websites authenticate with Active Directory (AD) using local IP address, the AD is only accessible in my corporate network. I want to migrate the IIS Websites to Azure Web Apps, but authenticate with the same on-premise AD.

Can I check what are the infrastructure configurations required for the AD?
What do I have to change in my application code to authenticate?
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Boon Chye PhangAsked:
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Cliff GaliherCommented:
The best way to do this is to use Azure Active Directory Domain Services (not to be confused with "Azure Active Directory.")

AADDS was specifically designed to bring kerberos authentication  to Azure resources, whether they are VMs or others, such as IIS, and can be fully synced with AD.  

The other options would be opening up Swiss cheese holes in your firewall (very insecure), setting up a VPN (significant single point of failure), or rearchitecting the app to use SAML/OATH/etc (a good long term goal, but labor intensive.)

AADDS allows a lift-and-shift approach with minimal effort.
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Is it a .NET website? Have a look at this website, specifically the WEB.config, I developed that authenticates against Active Directory
https://www.experts-exchange.com/articles/31477/Free-Open-Source-Self-Service-Password-Reset-tool-for-Active-Directory.html
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