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MF_E_NET_NOCONNECTION
MF_E_NET_NOCONNECTION means an operation was attempted without an established connection to the media server. It can follow a failed open, a previous disconnect, or an incorrect application state transition.
What to check
- Check the earlier open/connect result; this code is often secondary to a previous failure.
- Ensure that client code does not issue session operations before source initialization is complete.
- Verify DNS, port reachability, proxy selection, and protocol configuration for the target URL.
Microsoft: Networking in Media Foundation
Microsoft: Supported protocols for Media Foundation network sources
Microsoft: Media Foundation client logging
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