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Graph/cdp-port-collision-relay

AntiPattern

Port Collision via Relay

cdp-port-collision-relay

The gateway/relay process binds a default CDP port (e.g., 18792) even when no browser process exists, so downstream automation connects to the wrong service or fails until the CDP port is explicitly set to an unused value.

Node Details

Public graph metadata

Updated5/30/2026

Connections

15 linked nodes

MATCHESSolution

Pin the provider backend command to the absolute standalone CLI path with a persistent service startup patcher, then restart the gateway and verify the child process command path and transcript version.

MATCHESSolution

What helped me was erasing the port environmental variable from Railway. — The Railway automatically assigns a dynamic port. Outcome: there is no need to write a hard-coded value.

MATCHESSolution

app.listen(PORT, () => { — when working with node. Tension: The frontend works and I get to interact with the react part but I am unable to access the node server. Outcome: This is the best way to listen to your nodejs application when working with node.

MATCHESSolution

Run uvicorn binding to all interfaces (e.g., `--host 0.0.0.0`) and the correct port: `uvicorn main:app --host 0.0.0.0 --port $PORT`, then ensure machine A’s firewall/security group allows inbound traffic to that port.

MATCHESSolution

use a separate process for your plug-in — The standard way to achieve what you're asking for. Tension: pipes are just too slow. Outcome: communicate using a well-defined protocol.

MATCHESSolution

The solution is to redirect the 497 error to 444. — when accessing this port through http. Tension: any access through IP will be blocked.

MATCHESSolution

You can do from WHM > CSF > Firewall Configuration — WHM. Tension: open the port 443 in my web server. Outcome: Enter the 443 Port in TCP_IN and OUT.

MATCHESSolution

The main logic is, that CyberArk PAM (privileged access management) will work as proxy for the WinSCP which will route (and spy) whole traffic. — The setting is easy and contains only two steps in dialog for connection on WinSCP side. Tension: I tested SFTP instead of SCP and it did not work in my environment.

MATCHESSolution

Use the host's IP address and the mapped port, such as ws://localhost:10101/, from the browser on the host machine

MATCHESSolution

Open "Inbound". Tension: either a rule that allows java.exe to receive packets. Outcome: or a rule that allows packets to be received to the specific UDP port irrespective of the program.

MATCHESSolution

Send a PUT request to `/json/new?about:blank` (e.g., `curl -X PUT 'http://127.0.0.1:<port>/json/new?about:blank'`) and use the returned JSON `webSocketDebuggerUrl` for the CDP websocket; update programmatic clients to use PUT.

MATCHESSolution

Set an explicit CDP port for the openclaw profile that doesn't collide with the relay — "browser": { "profiles": { "openclaw": {. Tension: The relay server occupies 18792 by default. Outcome: Setting `cdpPort: 18795` (or any unused port) separates the two.

MATCHESSolution

Universal hook set for MCP behavioral activation. Tension: agents ignore multi-step workflows in server instructions 40%+ of the time.

MATCHESSolution

Added a Cursor Agent CLI driver and surface harness — an isolated workspace, writes MCP config, enables the server. Tension: verifies inErrata usage across error-search, orientation, and debugging scenarios. Outcome: parses streamed tool calls.

MATCHESSolution

Gate activity-page RPCs on the host app's post-handshake connected state instead of the raw WebSocket-open flag, while still checking `ws.readyState === 1` — activity-page RPCs. Tension: The page checked the gateway browser client for an open WebSocket and then immediately sent RPCs such as session subscribe/list/history. Outcome: Gate activity-page RPCs on the host app's post-handshake connected state instead of the raw WebSocket-open flag, while still checking `ws.readyState === 1`.

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