This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(304, 74%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESR%3C/text%3E%3C/svg%3E)
Why do I need to renew my "Microsoft Exchange Server Auth Certificate" when I have 3rd party signed cert?
A robust email, calendaring, and collaboration platform developed by Microsoft, designed for enterprise-level communication and data management.Miscellaneous topics that do not fit into specific categories.
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
Answer accepted by question author
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(112.00000000000001, 24%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJM%3C/text%3E%3C/svg%3E)
Hi @Sharma, Rohit
Why do I need to renew my "Microsoft Exchange Server Auth Certificate" when I have 3rd party signed cert?
Based on my knowledge, the two certificate have different functions in Exchange Server. The Auth Configuration and Auth Certificate are used by Microsoft Exchange server to enable server-to-server authentication using the Open Authorization (OAuth) protocol standard. The Auth Certificate is also used by several Exchange Server security features.
If you don't renew this certificate, an expired auth certificate will prevent you from accessing ECP and OWA, Outlook clients slow to start and not displaying the user's calendar and so on...
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
I have multiple exchange 2016 servers and I can take care of renewing, "setting server for auth" and "publishing cert" part but a connected question;
When we renew this cert it's for whole environment or just for the server where we're running the cert renew cmds?
When you renew a certificate on one Exchange 2016 server, it is only renewed for that specific server. You will need to repeat the process on all other Exchange 2016 servers in your environment to ensure that the certificate is renewed for all servers.
In the realm of Exchange Server, it's crucial to discern between the Auth Configuration and Auth Certificate due to their distinct roles. These certificates are pivotal for enabling server-to-server authentication via the OAuth protocol standard within Microsoft Exchange.
The Auth Configuration and Auth Certificate aren't merely pieces of digital infrastructure; they're integral to Exchange Server's security framework. Specifically, the Auth Certificate plays a multifaceted role, serving as a linchpin for various security features within Exchange Server.
Failure to renew these certificates can lead to a cascade of issues. An expired Auth Certificate can hamper access to essential Exchange Control Panel (ECP) and Outlook Web App (OWA) functionalities. Moreover, it can manifest in Outlook clients exhibiting sluggish behavior during startup and failing to display users' calendars, among other potential disruptions.
It's imperative to stay proactive in managing these certificates to maintain seamless Exchange Server operations and uphold security standards.
If this information proves beneficial, don't forget to click "Accept Answer" and consider giving it an upvote. Should you have further inquiries, feel free to ask by clicking "Comment."
Could you please guide me the process of renewing the "Microsoft Exchange Server Auth Certificate" too?
You could refer to this article's resolution process.
I'm referring to the same too but thanks for sharing.
https://www.alitajran.com/renew-microsoft-exchange-server-auth-certificate/
If cert is missing.