What does HRESULT 0xC00D28AF (NS_E_DRM_UNABLE_TO_OPEN_PORT) mean?

NS_E_DRM_UNABLE_TO_OPEN_PORT

Why the symbolic result matters

When NS_E_DRM_UNABLE_TO_OPEN_PORT is returned, the system has already established that the application cannot bind the port used for WMDRM-ND proximity messages. This result comes from WMDRM for Network Devices, whose state machine implements the transmitter/receiver protocol that registers a network playback device, approves it, validates proximity, opens a protected session and transcrypts licensed content for that receiver.

Confirm the producer by doing one thing first: record address, port, socket error and owning process.

Objects involved

Do not separate this result from its owning state: device certificate and serial number, registration-database entry, approval flag, validation timestamp, network session, protocol message and transcrypt policy. The diagnostic record is the exact WMDRM-ND message type, device identifier, certificate chain, registration state, round-trip timing and the first protocol HRESULT.

A later generic error must not replace this evidence: the original condition remains that the application cannot bind the port used for WMDRM-ND proximity messages.

Cause and successor state

Reconstruct the transition from the requested action to the rejected condition. To verify this, record address, port, socket error and owning process; the repaired transition must then free or correctly configure the port and firewall, then restart the proximity listener. The result model is suitable for a regression fixture because its expected state change is observable without weakening the DRM policy.

What separates this code

Adjacent HRESULTs

First failure versus cleanup

The application cannot bind the port used for WMDRM-ND proximity messages.

Verification sequence

1. Preserve it and 0xC00D28AF before cleanup, fallback or another media item changes the context.
2. Associate it with its current WMDRM for Network Devices object and the requested action.
3. Run the direct check: record address, port, socket error and owning process.
4. Compare the failure with a known-good case that changes only the property named by this condition: the application cannot bind the port used for WMDRM-ND proximity messages.
5. Apply the targeted fix: free or correctly configure the port and firewall, then restart the proximity listener.

Safe recovery

Correct this layer directly and free or correctly configure the port and firewall, then restart the proximity listener.

Technical references

• Windows Media DRM 10 for Network Devices
• Device registration
• Using the WMDRM-ND protocol
• MS-DRMND protocol specification