> ## Documentation Index > Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt > Use this file to discover all available pages before exploring further. # API errors reference > Complete reference of node API error codes you may encounter on Chainstack — error explanations, common causes, and step-by-step troubleshooting solutions. ## HTTP status codes | Code | Message | Solution | | ---- | ----------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 400 | Bad Request | Your request is invalid. Make sure your request is properly formatted and this is a valid request. | | 401 | Authorization Required | The credentials you provide to access your node endpoint are absent or incorrect. See how to [know your node credentials](https://docs.chainstack.com/docs/manage-your-node#view-node-access-and-credentials). | | 404 | Not Found | [Contact support](https://support.chainstack.com/) to check if you are accessing the correct node and if the node is healthy. | | 404 | DEPTH\_ZERO\_SELF\_SIGNED\_CERT | [Contact support](https://support.chainstack.com/) to check if the gateway is healthy. | | 413 | Request Entity Too Large | The default limit of the request body size is 1 MB. Reduce the request body size. | | 429 | Too Many Requests | You hit the default node [HTTP connections limit](https://docs.chainstack.com/docs/handle-real-time-data-using-websockets-with-javascript-and-python#http-and-websocket-connection-limitations). Reduce the number of requests. | | 429 | You've exceeded the RPS limit available on the current plan | You hit the [rate limit on your plan](https://docs.chainstack.com/docs/pricing-introduction#rate-limits). Reduce the request rate or upgrade to a higher plan. See also [RPS plan limits](https://docs.chainstack.com/docs/rps-plan-limits). | | 429 | You've reached your monthly quota of Request Units (RUs) | You exhausted the monthly RU quota on your plan. [Enable extra usage](https://console.chainstack.com/user/settings/billing) to continue beyond the quota or upgrade for more RUs. See also [Quotas](https://docs.chainstack.com/docs/quotas). | | 499 | No Response From Node | Increase the client-side time-out. [Contact support](https://support.chainstack.com/) if the issue persists. | | 500 | Internal Server Error | [Contact support](https://support.chainstack.com/) to check if you are accessing the correct node and if the gateway is healthy. | | 500 | ECONNREFUSED | [Contact support](https://support.chainstack.com/). | | 502 | Bad Gateway | [Contact support](https://support.chainstack.com/) to check if your node is experiencing resource constraints or if the node is healthy. | | 503 | Service Temporarily Unavailable | [Contact support](https://support.chainstack.com/) to check if your node is experiencing resource constraints. | | 504 | Gateway Time-Out | [Contact support](https://support.chainstack.com/) to check if your node is experiencing resource constraints. Or consider getting a [dedicated gateway](https://docs.chainstack.com/docs/trader-node#dedicated-gateways). | ## WebSocket status codes | Code | Message | Solution | | ---- | ----------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 1006 | Socket Error: read ECONNRESET | [Implement a reconnect](https://docs.chainstack.com/docs/handle-real-time-data-using-websockets-with-javascript-and-python) in your code or get a [dedicated gateway](https://docs.chainstack.com/docs/trader-node#dedicated-gateways). | | 1009 | MESSAGE\_TOO\_BIG | The incoming WebSocket message exceeded the maximum allowed size. Increase or disable `max_size` in your WebSocket client configuration. | ## JSON-RPC status codes | Code | Message | Solution | | ------ | ------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | -32700 | Parse Error | Your JSON cannot be parsed on the server side. Make sure your JSON is properly formatted. | | -32600 | Invalid Request | Your JSON-RPC request is not properly formed. See [node API reference](https://docs.chainstack.com/reference/chainstack-platform-api-list-all-nodes). | | -32601 | Method Not Found | The method you are trying to call is not available on the node. See also [API namespaces](https://support.chainstack.com/hc/en-us/articles/360024806051). | | -32602 | Invalid Params | Your request has invalid parameters. See [node API reference](https://docs.chainstack.com/reference/chainstack-platform-api-list-all-nodes). | | -32603 | Internal Error | A JSON-RPC error that means your request cannot be processed and usually has a -32000 error with details on why the request cannot be processed. | | -32005 | Rate Limit Exceeded | You exceeded the RPS limit or monthly RU quota on your plan. The `message` field contains details on which limit was hit. The response may include a `data.try_again_in` field indicating when to retry. See [RPS plan limits](https://docs.chainstack.com/docs/rps-plan-limits) and [Quotas](https://docs.chainstack.com/docs/quotas). | | -32000 | Server Error | The implementation-defined error on the server. The node implementation shows why it cannot process the request. For example, see [EIP-1474](https://eips.ethereum.org/EIPS/eip-1474). |