Went through Windows Media Player Web Help button on my error message. They suggested checking settings under now playing, more options, Network, Streaming Protocols, and making sure all boxes are enabled. All are enabled. Went through trouble shooting. Information got too technical, but much of it seems to be directed at the provider (server's) end. Does any of the following (it's lengthy, but only partial) make sense to you, or do you have another suggestion besides enabling settings to allow mms streams as that's not doing the trick.
(About Protocol Rollover
If clients that support RTSP connect to a server running Windows Media® Services using an RTSP URL moniker (for example, rtsp://) or an MMS URL moniker (for example, mms://), the server uses protocol rollover to stream the content to the client to provide an optimal streaming experience. Automatic protocol rollover from RTSP/MMS to RTSP with UDP-based or TCP-based transports (RTSPU or RTSPT), or even HTTP (if the WMS HTTP Server Control Protocol plug-in is enabled) may occur as the server tries to negotiate the best protocol and provide an optimal streaming experience for the client. Clients that support RTSP include Windows Media Player 9 Series or later or other players that use the Windows Media Player 9 Series ActiveX control.
Earlier versions of Windows Media Player, such as Windows Media Player for Windows XP, do not support the RTSP protocol. However, the MMS protocol also provides protocol rollover support for these clients. Thus, when an earlier version of the Player attempts to connect to the server using an MMS URL moniker, automatic protocol rollover from MMS to MMS with UDP-based or TCP-based transports (MMSU or MMST), or even HTTP (if the WMS HTTP Server Control Protocol plug-in is enabled), may occur as the server tries to negotiate the best protocol and provide an optimal streaming experience for these clients.
To make sure that your content is available to all clients that connect to your server, ports on your firewall must be opened for all of the connection protocols that might be used during protocol rollover.
You can force your Windows Media server to use a specific protocol by identifying the protocol to be used in the announcement file (for example, rtspu://server/publishing_point/file). However, to provide an optimal streaming experience for all client versions, we recommend that the URL use the general MMS protocol. If clients connect to your stream using a URL with an MMS URL moniker, any necessary protocol rollover occurs automatically. Be aware that users can disable streaming protocols in the property settings of Windows Media Player. If a user disables a protocol, it is skipped during rollover. For example, if HTTP is disabled, then URLs will not roll over to HTTP. )
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This is only a small excerpt from their troubleshooting info on delivering streams. It goes on and on about enabling ports and basically Greek. I did not disable anything, and as I said before, all protocols are enabled for streaming. I'm lost.
Thanks,
Michele