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Exchange 2016: after installation of CU 18 attachments from shared mailbox can't be opened in OWA

Christoph 46 Reputation points
2020-09-30T10:31:23.44+00:00

Hi,

we installed last Thursday CU 18 on a single Exchange 2016. After that we recognized that attachment from shared mailboxes can't be opened anymore. This affects all attachments, download and preview. The problem seems to be that the URL for the attachment ist wrong. When we try to download an attchment a new windows is opened and we're redircted to a url in this format (original domain name is replaced):

"https://outlook.office365.com/owa/temp-test@domain-name.de/service.svc/s/GetAttachmentDownloadToken?redirect=%2fowa%2ftemp-test%40domain-name.de%2fservice.svc%2fs%2fGetFileAttachment%3fid%3dAAMkADVjYTJlNmVhLWU5YWUtNDExNC04YmI5LTNkNDI1NzU0YTRhZQBGAAAAAACFeKz%252b7LiwTJTGaiFKmoEUBwDgWBbEnQXzT5ipyGwAVbfZAAAAAAEMAADgWBbEnQXzT5ipyGwAVbfZAAAAAAk3AAABEgAQAHTIfMMNYkBEk%252bb%252f1UJcNZo%253d%26X-OWA-CANARY%3dji4zp9VACUGzxzvHkAjNH0AOjQZUZNgIt7lknLLRBv1JieCvW96de5oLgPWmV6rJSNOZafAG8fU.%26isDocumentPreview%3dFalse

I do not understand why this request is getting redirected to office365.com. We do not have an hybrid enviroment or anything like that. "Normal" user accounts does not have any problems. if we forward the affected e-mail from the shared mailbox to a real person, attachment can be opened. Event logs or similar do not show any related anomalies. Any ideas whats going on or how to fix this?

btw, problem exists only in OWA, the same attachment can be opened in Outlook without any problems. The problem also exists with a new shared mailbox.

kind regards Christoph

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Accepted answer
  1. David 91 Reputation points
    2020-10-14T09:57:17.057+00:00

    Hi everyone,

    Guess no one found a solution so far and we need a fix from MS?
    We have update to CU 18, same problem. But we do not have the recent updates installed from yesterday patch day.

    One workaround we discovered so far.
    Instead of "Open another mailbox..." you can access the shared mailbox with "Add shared folder..." instead.
    We run a DAG Exchange 2016 cluster on windows server 2012 R2 server.

    3 people found this answer helpful.

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  1. Christoph 46 Reputation points
    2020-10-27T09:44:15.913+00:00

    Hi,

    does anyone changed an SSL certificate after CU18? It looks like we found another bug. After changing the SSl certificate and bind it to SMTP as well (no matter if Powershell or ecp) everything looks fine, but after an refresh (ecp) or a new "get-exchangecertificate" in Powerhell it does not show the binding to the SMTP.

    can anyone confirm this?

    kind regards Christoph

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  2. Serhii Unharov 1 Reputation point
    2020-11-10T08:35:11.593+00:00

    I also discovered a problem when a user in OWA open mailbox from menu "open another mailbox"

    the preview does not work and open (download) - throws it to "https://outlook.office365.com/owa/t ...... Works only if you click" Download all "which is not convenient.

    Has anyone found a solution? Or maybe Microsoft has released a separate patch?
    CU wait a month, long time.

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  3. Iuric196 1 Reputation point
    2020-11-20T06:52:47.077+00:00

    I have linked shared mailbox in OWA using this article:

    How to open a mailbox shared folder in OWA 2016

    After that I was able to open the attached files from shared mailbox

    Hope this will help you.

    @Iuric196

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