"Windows Media Services and IIS can coexist on a computer when you use their default values. By default, HTTP streaming is not enabled in Windows Media Services; therefore, IIS can bind to port 80 for delivery of Web-based content. However, if
you decide that you want to use HTTP streaming in Windows Media Services, additional configuration is required because
both programs cannot bind to port 80 on the same Internet Protocol (IP) address."
Reference link:
https://docs.microsoft.com/en-us/iis/media/windows-media-services/using-http-for-streaming-and-downloading-from-the-same-computer
This issue seems more related to IIS, please refer to above link, hope it could help.
Regards,
Fletcher
MSDN Community Support
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