By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Unfortunately, hours of googling did not really help, there does not seem to be very much specific information about EWS and OAuth authentication, and I have no idea how to further troubleshoot it, so I'm hoping that anyone has some advice on how to get it working.

TokenCredentials is not the right class to use in this example. Like Jason mentioned put in place for other reasons. Only OAuth based access is supported. Granular permission such as Calendar. While "Full mailbox access" requires an admin to consent, admins from other tenants can consent as it is a web app. In case you want to develop a native app, the app has to be directly registered in the app of the tenant it runs in order to use "Full mailbox access".

EWS requires the special "Have full access to a user's mailbox" delegated permission in Azure Active Directory, which requires an administrator to register it. This permission also doesn't "travel" outside the organization, so there is no user-consent scenario for EWS. Essentially, the only scenario that this works for is an administrator registering the application for your own organization.

The simplest: Just add the token you get back to the request headers in an Authorization header, like so:. You can use saml if from a certified domain of the aad, and you swap that token using the ms online sts. I did this, and its trivial to find my writeups on the web. The older model is cute in some ways, as you are not tied to aad oauth, for your own app, only becoming tied to aad land when talking to microsoft properties.

If one has, with openid connect, a vendor mobile token a tgt, in all but nameperhaps i can live with some codependence. So i have an aad netmagic. Do i go make a webapi class app in aad, assign THAT the office permissions? Learn more. Asked 6 years ago. Active 3 years, 4 months ago. Viewed 12k times. All; service. GetExchangeServiceInfo ; if!

GetAuthorizationUrl Request. Bind service, WellKnownFolderName. Inbox ; On the Folder. Bind call, I get a Unauthorized error.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

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Hybrid Setup Issues

I am developing a Provider hosted app in sharepoint for calling EWS services. I am using managed api. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.

WebException: The remote server returned an error: Unauthorized. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Learn more. Asked 5 years, 6 months ago.

Active 5 years, 6 months ago. Viewed times. Exchange ; service. AccessToken ; service. Today, DateTime. The remote server returned an error: Unauthorized. Matt Gibson 13k 6 6 gold badges 43 43 silver badges 72 72 bronze badges. Deepa Moorjmalani Deepa Moorjmalani 21 1 1 bronze badge. Welcome to SO. I've edited your question to make it a bit easier to read. Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

Post as a guest Name. Email Required, but never shown. The Overflow Blog.Authentication and access to a mailbox is an often misunderstood area. I'm going to cover Authentication and type of access impersonation vs delegate access vs direct access and common problems developers run into in this article.

Authorizing access to things in a mailbox is handled by Exchange. If Impersonation or delegation don't work but you can authenticate then the issue is most likely going to be with Exchange or the client code and not with IIS as it would be a authorization issue.

What it can access in those mailboxes such as specific folders cannot be filtered or defined. Only an Exchange Admin can configure an EWS Impersonation account for impersonating and configure its mailboxes to allow the impersonation. Its best to use WebCredentials.

You will need to specify credentials. Try using a WebCredential. Of course! We do fix stuff. So, anytime you run into an issue with this API and are using an older version then you should test with the latest release to be sure your not dealing with something already fixed. Yes, it can take a while. By default, it is set to true. POX is used for out of network autodiscover — so it should be used with Exchange Online or when the client application is otherwise not in-network with the Exchange server.

So, why is this important? Well, AutoDiscover processes are expensive.

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So, only do it when you need to, but do it when its needed. If the server had been in-network, then it would have completed far faster. With a lot of code samples and articles it looks like you would use your SMTP address for doing authentication.

However, this is not correct thinking. See the article below on how to add a UPN suffix. Without doing so you may get or errors at times. Not setting it can double or more the time it takes to complete the call. In some cases you can also get timeouts. The rule is to always set this header when using impersonation - this will make your EWS Impersonated code from Exchange work better with Exchange It should be set to be set to the mailbox being accessed with the exception of when streaming notifications are being done and in that case it should be set to the first mailbox in the subscription group.

With Exchange Online there are additional headers which need to be set for affinity. It needs to be a UPN. However, you can have a UPN which matches. When code uses both EWS Impersonation and delegate access the call is subject to limitations and restrictions for both.Keep in touch and stay productive with Teams and Officeeven when you're working remotely.

Learn More. Learn how to collaborate with Office Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.

HCW - Office was unable to communicate with your on-premises Autodiscover endpoint. This is typically due to incorrect DNS or Firewall configuration. The office tenant is currently configured to use the following URL for Autodiscover queries for the office tenant to the on-premises organization. The token cache is being cleared because "use cached token" was set to false.

WebException: The request was aborted: The request was canceled. I have no issue setting up mailboxes locally, but when I try migrate a mailbox from on-prem to office it fails and the error log is blank.

So battling to find the error here. We block smtp to the www, and only allow to a specific host Our Mailgateway not sure if this could be the problem? I have spent days on this, and have been through every MS guide available. I'm running a hybrid, and it will remain a hybrid, data is too expensive for me to send out directly from my production site. I don't pay for data from my head office, so the the applications that need to mail out, will always use that server.

The lepide software is another expense for something that should work natively. Did this solve your problem? Yes No. Sorry this didn't help. We have an official KB published for this kind of hybrid deployment error. Have you checked it already? Specifically, please focus on the Firewall is blocking required IP addresses from accessing on-premises servers section and see if you have allowed all the required URLs and IP address ranges on your firewall. And if everything required has been allowed, would you please try bypassing all firewall settings temporarily to see if the issue relates to firewall settings at all?Exoprise recently added support for OAuth OAuth 2.

This capability has been requested in the past and with this new release, enables end-to-end testing of Exchange Online and the OAuth capabilities of Azure AD with Office from multiple concurrent locations.

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As adoption of Office grows, and it becomes more infused with system processes and workflow for an organization, the need for testing OAuth access and Azure AD performance becomes increasingly important.

Lastly, along with the OAuth capability, the Exchange Online sensors can now accept an application specific password when an account is configured for MFA multi-factor authentication. Getting started using OAuth for Exchange Online is simple. A popup window will appear where you can sign in and accept the Exoprise Exchange Online registration. This enables Exoprise to test the mailbox uptime, availability, mail flows and mail queue health as that account.

Click Next to proceed to validation and deployment just like a regular sensor. After accepting the OAuth registration, you'll return to the page with the selected credential. Click next to proceed to validation. Using OAuth credentials instead of real credentials for Exchange Online has a number of benefits over using real credentials.

When it comes to API security, its always better to use token-based security versus passing, managing and maintaining real credentials. While CloudReady takes extra care with respect to password security and end-to-end PKI encryption of credentials read about here in our Security Overviewusing token-based credentials is always more secure.

By leveraging OAuth credentials, you no longer have to manage the credentials of the account within CloudReady. You do still have to be aware of the OAuth registration but you have more control within your own system and account. By using OAuth, you, the owner of the account can limit access and scope to just what the OAuth registration is asking for. Translating the authentication to the use of a third-party access token provides these benefits.

Not only can the owner of the account control the scope of access to the data but the account owner can also control when they no longer want access to the resource the mailbox in this case to be granted.

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If you de-register the Exoprise OAuth registration from the account, then the sensor will fail and will no longer be able to access the token. Now, within CloudReady, you can centrally manage the credentials that are being used across different OAuth sensors.

Exoprise will introduce more centrally managed credential management features in future releases with additional support for token-based authentication and protocols.

Within the CloudReady platform, multiple sensors can leverage the same OAuth token, either sensors deployed to public or private sites. This enables testing from different locations while still leveraging a centralized token that only needs to be accepted and managed once. We will briefly note a few:. Exoprise has more OAuth testing in the works with additional sensors planned that leverage and take advantage of shared OAuth registration, Graph and other APIs. Team Exoprise represents multiple people in the engineering, sales and marketing department here at Exoprise.

It takes a village. CloudReady dashboards enable a great degree of customization, a wide array of widgets, and the…. CloudReady can easily monitor web pages and SaaS Applications from the end-user perspective. This article…. Ready to Optimize Your Apps and Network? Sign into Office with the account that you would like to use and test. For the Exchange Online OAuth registration, the required permissions are presented.

Validation of OAuth credentials before deployment to a site. API Security When it comes to API security, its always better to use token-based security versus passing, managing and maintaining real credentials. Control of Access Not only can the owner of the account control the scope of access to the data but the account owner can also control when they no longer want access to the resource the mailbox in this case to be granted.Since world is moving towards Cloud and away from Basic authentication, I also have to address this in my scripts.

Besides this I appreciate this change and believe it or not with the latest Exchange versions you can use OAuth already on your on-premises environment. You just need to give consent, which looks like this.

Authentication and EWS in Exchange

Once you consent, you can retrieve a token and decode the AccessToken with your preferred tool. There are many ways how to retrieve a token. Thus means you need to have ADAL somewhere installed on your computer. I updated the function to use the proper methods, depending on the version. If you want to use another version, you would need to open a new PowerShell session.

This is a limitation of PowerShell with assemblies, which is written here :. If the module includes an assembly. Assuming you store the token in a variable, e. I previously mentioned you can use OAuth also for on-premises. But for this some more steps needs to be done:. I hope this helps you and clarifies some questions. I can only encourage you start working with OAuth. Thanks for the really useful post. Unfortunately I am not able to get it working.

Exception: System. RuntimeException: Method invocation failed because [Microsoft. Run InterpretedFrame frame at System. Any ideas or thoughts on how to resolve?

Like Like. Thanks for this catch! Ciao, Ingo. Thanks Ingo. Strangely enough when I changed it back to use the EXO module it still fails with the same error.

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Would be great to get it working with ADAL v3 too. Thus when you had this module imported before it still reference to the other one. Also one additional thing. When you open a new PowerShell it should work. Update Find information to help you choose the right authentication standard for your EWS application that targets Exchange.

Exchange Online, Exchange Online as part of Officeand on-premises versions of Exchange starting with Exchange Server support standard web authentication protocols to help secure the communication between your application and the Exchange server.

If you're targeting Exchange Online, the authentication method that you choose must use HTTPS to encrypt the requests and responses that your application sends. The authentication method that you choose depends on the security requirements of your organization, whether you are using Exchange Online or Exchange on-premises, and whether you have access to a third-party provider that can issue OAuth tokens.

This article provides information that will help you select the authentication standard that's right for your application. We recommend that all new applications use the OAuth standard to connect to Exchange Online services. The advantage in security over basic authentication is worth the additional work required to implement OAuth in your application.

For the record, however, there are also some disadvantages that you should be aware of. Exchange Online requires tokens issued by the Azure Active Directory service, which is supported by the ADAL; however, you can use any third-party library. To learn more about using OAuth authentication in your EWS application, see the following resources:.

Office trialto set up an Exchange server to use to test your client application. Azure AD Authentication Library for.

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Configure Azure Active Directoryto enable your application to use OAuth tokens for authentication. NTLM authentication is only available for Exchange on-premises servers. For applications that run inside the corporate firewall, integration between NTLM authentication and the. NET Framework provides a built-in means to authenticate your application.

Basic authentication provides a, well, basic level of security for your client application. We do recommend that all new applications use either NTLM or the OAuth protocol for authentication; however, basic authentication can be the correct choice for your application in some circumstances. You need to decide if basic authentication meets the security requirements of your organization and customers.

Basic authentication can be the right choice if you want to avoid extensive setup tasks, for example for simple test or demonstration applications. Skip to main content.

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Exit focus mode. Exchange provides the following authentication options for you to choose from: OAuth 2. OAuth authentication We recommend that all new applications use the OAuth standard to connect to Exchange Online services. Table 1. Advantages and disadvantages of using OAuth Advantages Disadvantages OAuth is an industry-standard authentication protocol. Authentication is managed by a third-party provider. Your application does not have to collect and store the Exchange credentials. Fewer worries for you, because your application only receives an opaque token from the authentication provider; therefore, a security breach in your application can only expose the token, not the user's Exchange credentials.

OAuth relies on a third-party authentication provider.

OAuth 2.0 access tokens explained

This can impose additional costs on your organization or your customers. The OAuth standard is more difficult to implement than basic authentication. To implement OAuth, you need to integrate your application with both the authentication provider and the Exchange server.

To learn more about using OAuth authentication in your EWS application, see the following resources: Office trialto set up an Exchange server to use to test your client application. Table 2. You can configure access to Exchange services by using an Exchange Management Shell cmdlet. Uses the. Code samples are available that use the logged on user's credentials for authentication to an on-premises Exchange server. Users must be logged on to a domain to use NTLM authentication.

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