| Previous | Next |
| NS_E_DRM_CERTIFICATE_SECURITY_LEVEL_INADEQUATE | NS_E_DRM_BAD_REQUEST |
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. NS_E_DRM_UNABLE_TO_OPEN_PORT 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. The standard AllStat text is already shown above; this custom section concentrates on the object state and the evidence needed to separate NS_E_DRM_UNABLE_TO_OPEN_PORT from neighboring Windows Media errors.
Objects involved
Do not separate NS_E_DRM_UNABLE_TO_OPEN_PORT 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 for NS_E_DRM_UNABLE_TO_OPEN_PORT 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
For NS_E_DRM_UNABLE_TO_OPEN_PORT, reconstruct the transition from the requested action to the rejected condition. The proof step is to 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 NS_E_DRM_UNABLE_TO_OPEN_PORT model is suitable for a regression fixture because its expected state change is observable without weakening the DRM policy.
What separates this code
| Field | Value for NS_E_DRM_UNABLE_TO_OPEN_PORT |
|---|---|
| Lower result | the earliest store, network, cryptographic, driver or provider status preceding the final NS_E_DRM_UNABLE_TO_OPEN_PORT wrapper |
| Owner | operation, API/callback, object or session identifier, and component/device version associated with NS_E_DRM_UNABLE_TO_OPEN_PORT |
| Direct check | record address, port, socket error and owning process |
| Policy input | requested action plus the exact license, certificate, profile, output or registration property evaluated by NS_E_DRM_UNABLE_TO_OPEN_PORT |
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence NS_E_DRM_UNABLE_TO_OPEN_PORT |
Adjacent HRESULTs
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_UNSUPPORTED_ACTION | the WMDRM-ND endpoint or policy does not implement the requested operation |
NS_E_DRM_CERTIFICATE_SECURITY_LEVEL_INADEQUATE | the peer certificate is valid but its security level is below the operation’s minimum |
NS_E_DRM_BAD_REQUEST | a WMDRM-ND request has invalid framing, fields or message semantics |
First failure versus cleanup
For NS_E_DRM_UNABLE_TO_OPEN_PORT, the established fact is that the application cannot bind the port used for WMDRM-ND proximity messages. For NS_E_DRM_UNABLE_TO_OPEN_PORT, that fact does not independently establish damaged media bytes, a missing decoder, a generally broken network, or invalid rights for every other action.
If the Player, encoder, setup program or device layer later emits a broader error, retain NS_E_DRM_UNABLE_TO_OPEN_PORT as the first specific result. The object and operation attached to NS_E_DRM_UNABLE_TO_OPEN_PORT are usually more diagnostic than a later cleanup or user-interface summary.
Verification sequence
- Preserve
NS_E_DRM_UNABLE_TO_OPEN_PORTand0xC00D28AFbefore cleanup, fallback or another media item changes the context. - Associate
NS_E_DRM_UNABLE_TO_OPEN_PORTwith its current WMDRM for Network Devices object and the requested action. - Run the direct check for
NS_E_DRM_UNABLE_TO_OPEN_PORT: record address, port, socket error and owning process. - 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.
- Apply the narrow correction for
NS_E_DRM_UNABLE_TO_OPEN_PORT: free or correctly configure the port and firewall, then restart the proximity listener. - Repeat the same action with the same content/device identity and verify that
NS_E_DRM_UNABLE_TO_OPEN_PORTis not replaced by another policy or trust failure.
Safe recovery
Correct this layer directly and free or correctly configure the port and firewall, then restart the proximity listener. For NS_E_DRM_UNABLE_TO_OPEN_PORT, success means that the same requested action is accepted after that precise state change, not merely that another file or device happens to work.
- While investigating NS_E_DRM_UNABLE_TO_OPEN_PORT, keep this restriction: Do not delete the complete device-registration database before preserving the failing device record and certificate chain; that removes the distinction between registration, approval, validation and session failures.
- Do not alter trusted time, revocation enforcement, certificate validation or output policy merely to suppress
NS_E_DRM_UNABLE_TO_OPEN_PORT; that bypasses the decision instead of correcting its input. - Retain one failing artifact and one corrected artifact so the resolution of
NS_E_DRM_UNABLE_TO_OPEN_PORTcan be regression-tested.
A useful automated test
For the final NS_E_DRM_UNABLE_TO_OPEN_PORT test, keep the content KID or file hash, requested action, user/account, device identity and output route unchanged wherever they apply. The NS_E_DRM_UNABLE_TO_OPEN_PORT case is resolved only when the operation completes without this HRESULT and without a substitute failure from a neighboring license, trust, session or policy check.
Technical references for NS_E_DRM_UNABLE_TO_OPEN_PORT
- Windows Media DRM 10 for Network Devices — provides the normative workflow relevant to NS_E_DRM_UNABLE_TO_OPEN_PORT.
- Device registration — lists the security and state transitions used to interpret NS_E_DRM_UNABLE_TO_OPEN_PORT.
- Using the WMDRM-ND protocol — defines the platform objects used when diagnosing NS_E_DRM_UNABLE_TO_OPEN_PORT.
- MS-DRMND protocol specification — documents the protocol or API boundary behind NS_E_DRM_UNABLE_TO_OPEN_PORT.
Looking for a different code? Search another status or error code.