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E_PROTOCOL_VERSION_NOT_SUPPORTED
E_PROTOCOL_VERSION_NOT_SUPPORTED (0x83760005) means the Windows protocol component encountered peer requests an unsupported WebSocket protocol version. The opening handshake advertises a WebSocket version that the Windows stack cannot use for this session. Identify the failing layer before changing HTTP, TLS, or application payload settings.
Preserve the version exchange
| Evidence | Use |
|---|---|
| Client header | The Sec-WebSocket-Version value sent with the upgrade request. |
| Server response | Status and any version list returned by the server. |
| Intermediaries | Whether a gateway terminates and recreates the WebSocket handshake. |
Avoid unrelated fixes
TLS versions, HTTP versions, and the WebSocket protocol version are different negotiation layers. Changing cipher suites cannot correct a rejected Sec-WebSocket-Version value.
Test sequence
- Use the version required by RFC 6455 and the Windows API
- Send a deliberately unsupported version to confirm the rejection path
- Compare direct and proxied handshakes byte for byte
Completion
Both peers advertise and accept the same supported WebSocket version, and the negative-version test still fails before session functions are used.
Version belongs to the opening handshake
RFC 6455 uses WebSocket version 13. Capture the client version header and any server response advertising supported versions. Changing later frame fields cannot resolve a version negotiation failure because the connection has not entered the data-transfer state.
Incident record
| Record | Purpose |
|---|---|
| First failing operation | API name, object state, and exact return point |
| Original representation | Unmodified bytes or a stable hash captured before repair or normalization |
| Contract identity | Schema, protocol, database, or persistence version with feature flags |
| Negative control | One intentionally invalid case that must remain rejected |
Repeatability versus recovery
Opening handshake evidence
| Boundary | Required evidence |
|---|---|
| Client request | Method, target, Host, Upgrade, Connection, key, version, protocols, and extensions |
| Server response | Status, Upgrade, Connection, accept value, selected protocol, and extensions |
| Windows API inputs | Arrays, counts, and selected indices passed before the return |
| Post-handshake actions | Action types, buffers, context tokens, and completion calls |
Protocol rule being enforced
Capture the first peer bytes or API transition yielding this result; backoff can limit a reconnect storm but cannot repair negotiation or state, and direct versus proxied tests may differ because an intermediary can terminate and recreate the WebSocket.
Regression sequence
- Complete a baseline RFC 6455 handshake without optional extensions
- Exchange text and binary messages through the documented action loop
- Perform a clean close in both directions
- Introduce only the version, protocol, extension, frame, or call-order defect represented here
Wire and API ownership
| Boundary | Responsibility |
|---|---|
| HTTP upgrade | Owns request and response header syntax before the session opens |
| WebSocket framing | Owns opcode, masking, reserved bits, length encoding, fragmentation, and control-frame rules |
| Negotiated feature | Owns extension or subprotocol selection and its parameters |
| Windows action loop | Owns local handle state, buffers, action completion, and close sequencing |
Technical references
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