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With the Client Application Conditional Access option in Azure Active Directory, it is now possible to block OWA access based on IP addresses without using AD FS. To block external access to OWA but allow internal access, we must use the Locations condition, so open this tab. On the Locations tab, under Include, I select All Location. If you need to set restrictions on how and to sign in to users who sign in in office 365 and other services enrolled with Azure AD, you can use conditional access in Azure AD. By configuring Azure AD conditional access, you can define the conditions that must be met for a user to access certain services. If a user and device meet the defined conditions, specify the controls used to enforce the policy, and then specify the applications they access. Explanation: This configuration ensures that this conditional access policy enforces the restrictions configured in Outlook on the web for Exchange Online. Today, I`d like to take a look at using Azure conditional access to restrict external access to Exchange Online OWA. In Azure CA, the Client Applications condition is in preview, which allows us to block access to Exchange Online through a browser.

Combined with the Locations condition, we can block external access and allow access to Exchange Online through a browser only if the user is on the internal network. Excellent article. I would like to add that if you implement this, you need to do extensive testing. Different permutations of the above settings may have different results because other O365 applications have dependencies on Exchange Online. For example, if you restrict access to Microsoft Office Exchange Online, you also restrict access to Teams Web Access. In the simplest sense, conditional access policies allow you to block or grant access to specific resources and applications, depending on whether a user or device meets certain conditions. Here are some commonly used policies: In the New panel, select Grant Access Control to open the Grant panel. In the Grant panel, select Grant access > Require multi-factor authentication, and then click Select. The old solution to these problems with on-premises environments used to be VPNs. VPNs control who can and cannot connect to on-premises data.

However, once we start moving the data/resources to the cloud, we need to implement different solutions to control access to our data. With Intune App Protection, also known as Mobile App Management (MAM), you can use conditional access policies to ensure that Office 365 services are only accessible from certain Microsoft mobile apps. If you change or delete the policy with the restore option enabled, blocked devices from unselected users access Exchange. Otherwise, the access status of these devices will remain limited and you will need to manually change the access status of these devices. You can still get details about new devices that access Exchange Server, but they can`t restrict users who aren`t monitored by the policy. But while enforcing conditional access policies seems simple enough, integrations between Microsoft 365 apps make things more complex. For this example, we`ve configured additional security for users who access Office 365 if they are NOT from the enterprise (external) IP address range. Please note that multi-factor authentication only provides additional security if the user has the appropriate MFA devices on which they can sign in to Office 365 from any device. The restriction of all users can ideally be used to ensure that users can only access the organization`s data through authorized devices. If you want to better understand how the policy works, you can test the policy by applying it only to specific users and then to all users in your organization. For more information, see the steps to configure this policy in Manage email collaboration access by using Outlook for iOS and Android. We configure two conditional access policies to enforce conditions depending on whether a Windows device is inside or outside the corporate network: all devices that access Office 365 Exchange Online must be joined to a domain, and if they access the service from outside the network, they must use multi-factor authentication.

Conditional access, a tool used by Azure Active Directory, merges signals to help you enforce organizational policies. It`s used to strengthen defense against suspicious identities by allowing you to control access to apps based on identity, location, and device. You can then place user-specific controls that match the conditions. This can include requesting multi-factor authentication, allowing or blocking access based on location, or whether the device is domain joined or managed in Intune. .