@Amol_Patil
The 403 Forbidden error occurs when the WebSocket connection or subscription limits are not followed.
Please review the connection and subscription limits mentioned in the official documentation below and ensure your implementation adheres to them:
https://upstox.com/developer/api-documentation/v3/get-market-data-feed#normal-connection-and-subscription-limits
Once the limits are respected, the WebSocket connection should work as expected.