MCP Connection Issues: Why My MCP Server Kept Dropping Connections and How I Fixed It (After 86 Production Outages)

MCP Connection Issues: Why My MCP Server Kept Dropping Connections and How I Fixed It (After 86 Production Outages)

Honestly, I thought I had everything figured out after 86 outages. Logging was done. Health checks were in place. Tool discovery had fuzzy matching. Authentication handled every possible location. Rate limiting was working.

But my MCP server kept dropping connections randomly.

Three days of debugging later, I found the problem — and it wasn't what I expected. It was all about SSE (Server-Sent Events) streaming. If you're building an MCP server, you need to read this. I saved you three days of headache.

The Problem: Random Connection Drops