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NS_E_CANNOT_CONNECT_TO_PROXY
Investigating NS_E_CANNOT_CONNECT_TO_PROXY without losing the first failure
This result (0xC00D2EEE) marks the proxy address was resolved but a connection could not be established. The code belongs to the failing streaming stage, which is why a later network, codec or metadata error must be recorded separately instead of replacing it.
A Windows Media streaming request crosses name resolution, proxy selection, protocol negotiation, authentication, session creation and packet delivery. WMSP and related protocols maintain session state, so a valid TCP connection alone does not establish a usable media session.
Where the failure occurs
at that stage, the component has already accepted the earlier prerequisites but cannot cross the boundary described as the proxy address was resolved but a connection could not be established. That distinction matters: success in opening the file, resolving the host or creating a COM object does not prove that this later operation is valid.
For the strongest reproduction, repeat once with the same proxy explicitly configured and once with a direct connection, preserving the media URL and authentication identity. If the same call gets past this point after that single change, the changed precondition is relevant. If it does not, return to the first nested error instead of broadening the repair.
Network and protocol evidence
| Capture | Why it matters |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp for the original request. |
| Values to record | Original media URL, selected proxy source, proxy host and port, DNS result, authentication challenge, proxy response status and origin response if one was received. |
| Comparison case | Use one known-good resource that exercises the same streaming path while changing only the rejected precondition. |
Protocol-preserving retest
- Log
0xC00D2EEE, the exact operation and the first failure time. - Preserve original media URL, selected proxy source, proxy host and port, DNS result, authentication challenge, proxy response status and origin response if one was received.
- Perform one isolated test: repeat once with the same proxy explicitly configured and once with a direct connection, preserving the media URL and authentication identity.
- Repeat through the same API and protocol path; a different player or local-copy test is useful only as a comparison, not as proof that the recorded state is fixed.
- Confirm the expected next state and retain any new HRESULT as a separate downstream result before retrying.
Nearby results are not interchangeable
Main distinction: this HRESULT identifies a specific network or protocol stage and should not be collapsed into a generic connectivity failure.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_MSBD_NO_LONGER_SUPPORTED | The request depends on the retired MSBD transport instead of a supported protocol |
NS_E_PROXY_NOT_FOUND | name resolution or proxy discovery did not produce the configured proxy endpoint |
NS_E_SERVER_DNS_TIMEOUT | Media-server name resolution exceeded its allowed time |
Misleading actions
- Changing the origin server while also changing proxy mode, which prevents attribution to the proxy boundary.
- Do not publish credentials, protected-content material or complete private URLs before retrying. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the original condition.
Technical references
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