Fix Realtime Not Working in Supabase: Subscription Error Solution (2026)
How to Fix “Realtime Not Working” in Supabase (2026 Guide) The Short Answer To fix the “Realtime Not Working” issue in Supabase, advanced users can try increasing the connection timeout threshold to 30 seconds by updating the SUPABASE_CONNECTION_TIMEOUT environment variable. This change can reduce subscription errors and establish a stable realtime connection. Why This Error Happens Reason 1: The most common cause of this error is an unstable or slow network connection, resulting in the Supabase client timing out before establishing a realtime connection. According to Supabase documentation, the default connection timeout is set to 15 seconds, which may not be sufficient for slower networks. Reason 2: An edge case cause of this error is a misconfigured firewall or proxy server blocking the Websocket connection required for Supabase realtime functionality. This can occur when the firewall or proxy server is not properly configured to allow Websocket traffic. Impact: The subscription error caused by this issue can lead to delayed or missed updates, resulting in an inconsistent user experience. For example, in a collaborative editing application, a delayed update can cause users to overwrite each other’s changes. Step-by-Step Solutions Method 1: The Quick Fix Go to Settings > Realtime > Connection Settings Toggle Automatic Reconnection to Off Refresh the page to apply the changes and re-establish the connection. Method 2: The Command Line/Advanced Fix To increase the connection timeout threshold, run the following command in your terminal: ...