Exchange products online

Exchange products online

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Upgrade to Microsoft Edge to take advantage of exchange products online latest features, security updates, and technical support. If you've enabled security defaults in your organization, Basic authentication is already disabled in Exchange Online.

For more information, see What are security defaults? If you've reached this page because Basic authentication isn't working in your tenant, and you haven't set up security defaults or authentication policies, then we might have disabled Basic authentication in your tenant as part of our wider program to improve security across Exchange Online.

Check your Message Center for any posts referring to Basic authentication, and read Basic Authentication and Exchange Online for the latest announcements concerning Basic authentication. Basic authentication in Exchange Online uses a username and a password for client access requests. Blocking Basic authentication can help protect your Exchange Online organization from brute force or password spray attacks. When you disable Basic authentication for users in Exchange Online, their email clients and apps must support modern authentication.

Those clients are:. Outlook or later Outlook requires a registry key change. See Enable Modern Authentication for Office on Windows devices for more information, exchange products online. If your organization has no legacy email clients, you can use authentication policies in Exchange Online to disable Basic authentication requests, which forces all client access requests to use modern authentication.

For more information about modern authentication, see Using modern authentication with Office clients. This topic explains how Basic authentication is used and blocked in Exchange Online, and the corresponding procedures for authentication policies.

Basic authentication is also known as proxy authentication because the email exchange products online transmits the username and password to Exchange Online, and Exchange Online forwards or proxies the credentials to an authoritative identity provider IdP on behalf of the email client or app.

The IdP exchange products online your organization's authentication model:. Federated authentication : The IdP is an on-premises solution like Active Directory Federation Services AD FS. These authentication models are described in the following sections. For more information, see Choose the right authentication method for your Azure Active Directory hybrid identity solution, exchange products online.

Exchange Online receives a Security Assertion Markup Language SAML token from the on-premises IdP. You block Basic authentication in Exchange Online by creating and assigning authentication policies to individual users, exchange products online. The policies define exchange products online client protocols where Basic authentication is blocked, exchange products online, and assigning the policy to one or more users blocks their Basic authentication requests for the specified protocols.

When it's blocked, Basic authentication in Exchange Online is blocked at the first pre-authentication step Step 1 in the previous diagrams before the request reaches Azure Active Directory or the on-premises IdP, exchange products online. The benefit of this approach is brute force or password spray attacks won't reach the IdP which might trigger exchange products online lock-outs due to incorrect login attempts. Because authentication policies operate at the user level, Exchange Online can only block Basic authentication requests for users that exist in the exchange products online organization.

For federated authentication, if a user doesn't exist in Exchange Online, the username and password are forwarded to the on-premises IdP. For example, consider the following scenario:. An organization has the federated domain contoso. com and uses on-premises AD FS for authentication, exchange products online. The user ian contoso. com exists in the on-premises organization, but not in Office or Microsoft there's no user account in Azure Active Directory and no recipient object in the Exchange Online global address list.

An email client sends a login request to Exchange Online with the username ian contoso. An authentication policy can't be applied to the user, and the authentication request for ian contoso.

com is sent to the on-premises AD FS. The on-premises AD FS can either accept or reject the authentication request for ian contoso. If the request is accepted, a SAML token is returned to Exchange Online. As long as the SAML token's ImmutableId value matches a user in Azure Active Directory, Azure AD will issue a user ticket to Exchange Online the ImmutableId value is set during Azure Active Directory Connect setup. In this scenario, if contoso.

com uses on-premises AD FS server for authentication, exchange products online, the on-premises AD FS server will still receive authentication requests for non-existent usernames from Exchange Online during a password spray attack. In an Exchange hybrid deployment, authentication for your on-premises mailboxes will be handled by your on-premises Exchange servers, exchange products online authentication policies won't apply.

For mailboxes moved to Exchange Online, exchange products online, the Autodiscover service will redirect them to Exchange Online, and then some of the previous scenarios will apply, exchange products online. You manage all aspects of authentication policies in Exchange Online PowerShell. The protocols and services in Exchange Online that you can block Basic authentication for are described in the following table.

Typically, when you block Basic authentication for a user, we recommend that you block Basic authentication for all protocols. For email clients and apps that don't support modern authentication, you need to allow Basic authentication for the protocols and services that they require.

These protocols and services are described in the following table:. Blocking Basic authentication will block app passwords in Exchange Online. For more information about app passwords, see Create an app password. Verify that modern authentication is enabled in your Exchange Online organization it's enabled by default. For more information, see Enable or disable modern authentication for Outlook in Exchange Online.

Verify your email clients and apps support modern authentication see the list at the beginning of the topic. Also, verify that your Outlook desktop clients are running the minimum required cumulative updates.

For more information, exchange products online, see Outlook Updates. To learn how to connect to Exchange Online PowerShell, see Connect to Exchange Online PowerShell. The steps to create and apply authentication policies to block Basic authentication in Exchange Online are:.

Wait 24 hours for the policy to be applied to users, or force the policy to be immediately applied. To create a policy that blocks Basic authentication for all available client protocols in Exchange Online the recommended configurationexchange products online, use the following syntax:.

For detailed syntax and parameter information, see New-AuthenticationPolicy. You can't change the exchange products online of the policy after you create it the Name parameter isn't available on the Set-AuthenticationPolicy cmdlet. To enable Basic authentication for specific protocols in the policy, see the Modify authentication policies section later in this topic. The same protocol settings are available on the New-AuthenticationPolicy and Set-AuthenticationPolicy cmdlets, and the steps to enable Exchange products online authentication for specific protocols are the same for both cmdlets.

The methods that you exchange products online use to assign authentication policies to users are described in this section:. Filter user accounts by attributes : This method requires that the user accounts all share a unique filterable attribute for example, Title or Department that you can use to identify the users. The syntax uses the following commands two to identify the user accounts, and the other to apply the policy to those users :. This example assigns the policy named Block Basic Auth to all user accounts whose Title attribute contains the value "Sales Associate", exchange products online.

Use a list of specific user accounts : This method requires a text file to identify the user accounts. Values that don't contain spaces for example, the Office or Microsoft work or school account work best.

The text file must contain one user account on each line like this:. The syntax uses the following two commands one to identify the user accounts, and the other to apply the policy to those users :.

Filter on-premises Active Directory user accounts that are synchronized to Exchange Online : For details, see the Filter on-premises Active Directory user accounts that are synchronized to Exchange Online section in this topic. By default, when you create or change the authentication policy assignment on users or update the policy, the changes take effect within 24 hours.

If you want the policy to take effect within 30 minutes, use the following syntax:, exchange products online. This example immediately applies the authentication policy to multiple users that were previously identified by filterable attributes or a text file. This example works if you're still in the same PowerShell session and you haven't changed the variables you used to identify the users you didn't use the same variable name afterwards for some other purpose.

For example:. To view a summary list of the names of all existing authentication policies, run the following command:. For detailed syntax and parameter information, see Get-AuthenticationPolicy. By default, when you create a new authentication policy without specifying any protocols, Basic authentication is blocked exchange products online all client protocols in Exchange products online Online.

To enable Basic authentication for a specific protocol that's disabled, specify the switch without a value. This example enables basic authentication for the POP3 protocol and disables basic authentication for the IMAP4 protocol in the existing authentication policy named Block Basic Auth. For detailed syntax and parameter information, see Set-AuthenticationPolicy. The default authentication policy is assigned to all users who don't already have a specific policy assigned to them.

Note that the authentication policies assigned to users take precedence over the default policy. To configure the default authentication policy exchange products online the organization, use this syntax:. For detailed syntax and parameter information, see Remove-AuthenticationPolicy. Take into account that a default authentication policy could be already configured.

See Configure the default authentication policy for details. Run the following command to find the distinguished name DN value of the authentication policy:. When an authentication policy blocks Basic authentication requests from a specific user for a specific protocol in Exchange Online, the response is Unauthorized. No additional information is returned to the client to avoid leaking any additional information about the blocked user.

An example of the response looks like this:. Behind the scenes, these options utilize Authentication Policies. If Authentication Policies were created in the past, modifying any of these selections will automatically create the first new Authentication Policy. This policy is visible only through PowerShell, exchange products online.

For advanced customers that may already be utilizing Authentication Policies, changes within the Exchange products online Admin Center will modify their existing default policy. Look through Azure AD Sign-in logs to get a good idea of which protocols clients are using before making any changes. This method uses one specific attribute as a filter for on-premises Active Directory group members that will be synchronized with Exchange Online. This method allows you to disable legacy protocols for specific groups without affecting the entire organization.

Throughout this example, we'll use the Department attribute, because it's a common attributes that identifies users based on their department and role.

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Trading approximately billion shares each day, the New York Stock Exchange (NYSE) is the leading stock exchange in the world. The exchange trades 23/08/ · When you enable modern authentication in Exchange Online, Windows-based Outlook clients that support modern authentication (Outlook or later) use modern authentication to connect to Exchange Online mailboxes. For more information, see How modern authentication works for Office client apps Guides and infographics showing how CodeTwo products can help Office and Exchange on-prem admins. Find a local reseller. Do you need to buy from a local reseller? No problem. We'll put you in touch with them. Free software for MVPs. If you are a Microsoft MVP, you can get free licenses for CodeTwo products