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Excel attachments can't be previewed in browser. Service Unavailable Error

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Hi experts,

I've come across an odd issue when trying to preview excel attachments anywhere in the system (Sales Orders, Inventory Journals, etc). The preview refuses to load and instead throws a "Service Unavailable error", pictured here.

pastedimage1677520048050v2.png

Here's some info:

No customization has been made to these screens, I've tried with multiple users and browsers, clearing cache and whatnot. 

This happens in Dev VMs (I've read this is intentional by Microsoft, but I'd like to know if there's a way to go about it), and in our Sandbox and Production environments. The Sandbox and Production environments are running these versions:

pastedimage1677515862617v3.png

Going to document management parameters, I've set the value for "natively web renderable" to yes for both of the excel types, but "No" and "Yes" don't really change the results. 

pastedimage1677515628914v1.png

We do not have a sharepoint server configured, but I don't know if this is relevant to the issue.
Finally, the Office Web Apps Server is configured to https://onenote.officeapps.live.com, as per Microsoft's documentation. 

pastedimage1677516108014v4.png

Is there a configuration I'm missing, or an update that solves this issue?

Thanks in advance for any insight you can give me here!

  • RE: Excel attachments can't be previewed in browser. Service Unavailable Error

    Yes, this applies to all users, on multiple browsers. All files can be downloaded with no issues, main complaint from users was not being able to preview it in the browser before downloading.

    Product version: 10.0.31 (10.0.1406.118)

    Platform version: Update55

    One thing I forgot to mention is that the solution is on-premises.

  • Alireza Eshaghzadeh Profile Picture
    Alireza Eshaghzadeh 13,564 Super User 2025 Season 1 on at
    RE: Excel attachments can't be previewed in browser. Service Unavailable Error

    Hi,

    Does it apply to all users? Can you download the document and open it in your local pc?

    Which product version do have on sandbox and production environments?

  • RE: Excel attachments can't be previewed in browser. Service Unavailable Error

    Thank you for your answer.

    I was aware that this is the standard behavior for Dev VM's, however, this doesn't really explain why the sandbox and production environments (which are not virtual machines) have this issue.

  • Alireza Eshaghzadeh Profile Picture
    Alireza Eshaghzadeh 13,564 Super User 2025 Season 1 on at
    RE: Excel attachments can't be previewed in browser. Service Unavailable Error

    Hi Salvador,

    Ref. to the following issue, this behavior is by design for Developer VM.

    pastedimage1677563986973v1.png

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