What does HRESULT 0xC00D158B (NS_E_PORT_IN_USE_HTTP) mean?

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One usage of each socket address (protocol/network address/port) is permitted. Verify that other services (such as IIS) or applications are not attempting to use the same port and then try to enable the plug-in again.%0

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NS_E_PORT_IN_USE	NS_E_HTTP_TEXT_DATACONTAINER_INVALID_SERVER_RESPONSE

NS_E_PORT_IN_USE_HTTP

How to investigate `NS_E_PORT_IN_USE_HTTP`

What the server is validating

This result (0xC00D158B) marks the WMS HTTP control plug-in conflicts with IIS or another HTTP listener on the selected endpoint. The code identifies a narrow server contract, so diagnosis should preserve the object generation and the first native return.

Administration and system plug-ins validate concrete properties before they bind sockets, emit logs, download remote data or archive a stream., a failure at this layer should be diagnosed from the plug-in configuration and its first lower-level result. In a this result trace, export the exact plug-in property values and record the service identity. While diagnosing it, mMC display text alone can hide binding scope, normalized URLs or inherited defaults. The decisive question is whether the live object and values match that boundary; the base AllStat description alone does not reveal the object generation, selected plug-in or lower-level failure.

Build a reproducible incident record

Evidence	Why it matters for it
Decisive state	HTTP IP/port binding, IIS sites, HTTP.sys reservations, WMS plug-in settings and owning process/service.
Owning object	Record the server, publishing point, playlist, namespace node, plug-in or cache item that returned this result, including its creation or restart time.
First lower-level result	Preserve the earliest Win32, socket, COM, parser or plug-in event before the HRESULT; later wrappers can map several causes to this result.
Controlled comparison	Use a known-good object of the same type and vary only the precondition described as “the WMS HTTP control plug-in conflicts with IIS or another HTTP listener on the selected endpoint”.
Security-sensitive data	Log identifiers, lengths, hashes and redacted URLs where possible; do not publish passwords, authorization files or unrestricted client data.

Do not merge nearby HRESULT values

Primary distinction: generic port in use can affect any socket plug-in; it specifically identifies the HTTP control path.

Nearby result	Different checkpoint
`NS_E_HTTP_TEXT_DATACONTAINER_INVALID_SERVER_RESPONSE`	Compare its own symbolic boundary and the first failing call; it must not be grouped automatically with it.
`NS_E_PORT_IN_USE`	Relative to it, this neighboring result belongs to another state or validation branch even when the user-visible symptom is similar.
`NS_E_ARCHIVE_REACH_QUOTA`	Use the object type and operation sequence to determine which result is authoritative.

Code-specific failure anatomy

In a representative incident, the server reaches the WMS HTTP control plug-in conflicts with IIS or another HTTP listener on the selected endpoint and rejects the operation before the caller can safely assume the next stage occurred. The incident record should therefore join HTTP IP/port binding, IIS sites, HTTP.sys reservations, WMS plug-in settings and owning process/service with the object generation and the exact administrative or protocol request.

A useful negative control is move IIS or WMS to a distinct binding and verify the intended service answers the port. If that change advances the same it call, the result supports this boundary. If it remains, return to the first lower-level event instead of broadening the repair.

The tempting but misleading response is changing RTSP settings while the HTTP endpoint remains occupied. That action does not test the distinction that matters here: generic port in use can affect any socket plug-in; it specifically identifies the HTTP control path. This distinction is also why monitoring should retain the symbolic name instead of storing only a generic COM failure.

Test the owning precondition

Capture 0xC00D158B, it, the exact API/administrative action and the first failure timestamp.
Preserve HTTP IP/port binding, IIS sites, HTTP.
confirm that the object still belongs to the current WMServer, publishing-point or presentation generation.
Perform one isolated experiment: move IIS or WMS to a distinct binding and verify the intended service answers the port.
Repeat the original the operation through the same protocol and service account; do not substitute a different client-side test.
After it, verify the expected next state and retain any later HRESULT as a separate pipeline result.

For automated tests, assert both the HRESULT and the resulting publishing-point, playlist, plug-in or archive state.

Changes that do not establish the cause

changing RTSP settings while the HTTP endpoint remains occupied.
avoid changing the publishing point, protocol, content and plug-in set in one test., such a test cannot show which precondition cleared the code.
Do not suppress it or replace it with a generic “media server error”; retain the symbolic code and owning operation in telemetry.

Interpret the retest

Retest observation	Interpretation
The same call still returns it	The rejected precondition has not changed, or the caller is still using an old object/configuration generation.
The operation advances and a later code appears	The boundary was cleared. After it, diagnose the new code at its own source, parser, sink, network or client stage.
A new object succeeds while the retained object fails	Object lifetime or stale context is part of the incident; update lifecycle handling rather than applying a machine-wide repair.
Only one publishing point, playlist, cache key or plug-in fails	The evidence favors object-specific configuration or content over a server-wide outage.

Technical references

Close the incident only after it clears on a current object.

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