Replit WebSocket Proxy Disconnecting
Your real-time features (chat, live updates, notifications) stop working after a few minutes because WebSocket connections are silently dropped. Users see stale data and must refresh the page to get updates again.
Replit routes WebSocket traffic through a reverse proxy that has idle connection timeouts. If no data is sent over the WebSocket for a period of time, the proxy closes the connection. Your app has no reconnection logic, so the connection stays dead until the user refreshes.
This is especially problematic for apps that use WebSockets for occasional updates (like notifications) rather than constant data streams. The connection sits idle between updates and gets killed by the proxy.
Error Messages You Might See
Common Causes
- Proxy idle timeout — Replit's reverse proxy closes WebSocket connections that are idle for too long (typically 60 seconds)
- No ping/pong heartbeat — the app does not send periodic keep-alive messages to prevent timeout
- No reconnection logic — when the connection drops, the client does not attempt to reconnect
- Container sleep — Replit free tier containers sleep after inactivity, killing all connections
- SSL/TLS handshake issues — WebSocket upgrade fails intermittently through the HTTPS proxy
How to Fix It
- Implement ping/pong heartbeat — send a ping message every 30 seconds from the server and respond with pong from the client
- Add client-side reconnection — detect disconnection and automatically reconnect with exponential backoff
- Use a WebSocket library with built-in reconnection — libraries like socket.io or reconnecting-websocket handle this automatically
- Handle connection state in UI — show a "reconnecting" indicator when the WebSocket is disconnected
- Use wss:// not ws:// — Replit requires secure WebSocket connections since it serves over HTTPS
Real developers can help you.
Victor Denisov
Developer
Prakash Prajapati
I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
BurnHavoc
Been around fixing other peoples code for 20 years.
Bastien Labelle
Full stack dev w/ 20+ years of experience
Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
Matt Butler
Software Engineer @ AWS
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
Rudra Bhikadiya
I build and fix web apps across Next.js, Node.js, and DBs.
Comfortable jumping into messy code, broken APIs, and mysterious bugs.
If your project works in theory but not in reality, I help close that gap.
Kingsley Omage
Fullstack software engineer passionate about AI Agents, blockchain, LLMs.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
How often should I send heartbeat pings?
Every 25-30 seconds is a safe interval. This keeps the connection alive through most proxy timeout configurations without creating excessive traffic.
Should I use WebSocket or socket.io on Replit?
socket.io is recommended because it includes automatic reconnection, heartbeats, and fallback to HTTP long-polling when WebSockets are unavailable.
Do WebSockets work on Replit free tier?
Yes, but the free tier containers sleep after inactivity. When the container sleeps, all WebSocket connections are dropped. Paid deployments stay active.