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(163.2, 7.000000000000001%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESD%3C/text%3E%3C/svg%3E)
Exchange 2019, Office Outlook 2016/2019.
Rebooted Exchange 2019 after installing a windows server 2019 update (kb5005102).
Incoming/outgoing email was still working. OWA still worked. However, Office Outlook clients were not connecting. Got the credential box, put in the credentials, Outlook opened in offline mode.
No errors in event viewer.
An additional reboot of the server (and router as a precaution) fixed the issue.
However, should this happen again, what additional troubleshooting steps are there, what caused this issue, what Exchange service under services is directly connected to this issue?
Thanks
Hi @Susan Dodds ,
I've checked the KB5005102 update for Windows Server 2019, and the only thing related with Exchange is that the Cluster Service might fail to start because a Cluster Network Driver is not found, as a known issue, because the the DAG is based on the Cluster service.
This issue occurs because of an update to the PnP class drivers used by this service. After about 20 minutes, you should be able to restart your device and not encounter this issue.
Actually I don't think restarting the server or install some Windows Server update patches will cause the crash of the Outlook clients.
You may try restarting IIS or checking if the Exchange services are running.
And if the issue still there, check the autodiscover: Right click the Outlook button while pressing CTRL, choose Test Email Autoconfiguration and:
Or use the official tool to test it: https://testconnectivity.microsoft.com/tests/exchange
Best regards,
Lou
If the response is helpful, please click "Accept Answer" and upvote it.
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.
Hi @Susan Dodds ,
Do the suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark the helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.
If you are still stuck in this issue, please feel free to post your questions.
Regards,
Lou
If the response is helpful, please click "Accept Answer" and upvote it.
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.
Hi @Susan Dodds ,
It has been a long time since last reply, did these suggestions help you? If the above suggestion helps, please click “Accept as answer” to mark helpful reply as an answer.Your action would be helpful to other users who encounter the same issue and read this thread.
Regards,
Lou
If the response is helpful, please click "Accept Answer" and upvote it.
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.