System Speech Synthesis and Application Pool Identity

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
20/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
csharp
Domain
backend, operating-systems

Research direction

Start by comparing the System.Speech.Synthesis behavior under IIS ApplicationPoolIdentity and NetworkService on Windows 10/IIS and Windows Server 2019 Datacenter. Investigate the application pool identity, permissions, and configuration involved; the issue is resolved when the web application streams audio to the HTML Audio control while retaining ApplicationPoolIdentity.

Written by the indexing model from the issue text.

Description

area-System.Speech question

This issue has been moved from a ticket on Developer Community.

Hi,

I have developed an ASP.Net web application that streams audio content using System.Speech.Synthesis to a HTML Audio control in a browser, which works locally on Windows 10/IIS. The local website in IIS has its own Application Pool and run the identity runs as ApplicationPoolIdentity

When this web application is then deployed to a domain-controlled Windows Server 2019 Datacenter the functionality doesn’t work.

After some investigation if I change the IIS website application pool identity to NetworkService, the functionality works.

I would like to keep the identity as ApplicationPoolIdentity.

Are then specific configurations or permissions that I can update to enable this to work with ApplicationPoolIdentity for the Windows Server 2019 Datacenter?

Thanks in advance

Original Comments
Feedback Bot on 2/4/2025, 09:42 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Adam Derbyshire on 2/25/2025, 04:53 AM:

(private comment, text removed)

Eric St. John [MSFT] on 3/13/2025, 10:30 AM:

We have converted this feedback item to a suggestion. This change was done to better reflect the feedback’s nature. It will allow other developers to easily find it and engage on it.

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