Milvus Connection Refused / Timeout (19530)

How to fix it

Try these in order — the most common fix is first.

1. 1. Check the server

   Copy steps
   1. Run docker ps and confirm Milvus is up
   2. Inspect logs for etcd or storage errors
   Did this fix it? Yes No

2. 2. Publish and open the port

   Copy steps
   1. Run with -p 19530:19530
   2. Open 19530 (gRPC) and optionally 9091 (HTTP) in the firewall
   Did this fix it? Yes No

3. 3. Connect correctly

   Copy steps
   1. MilvusClient(uri="http://localhost:19530")
   2. On Windows use Docker Desktop with WSL 2
   Did this fix it? Yes No

Symptoms

Fail connecting to server on localhost:19530. Timeout; connection refused.

Why it happens

• Container stopped or still starting
• Port 19530 not published
• Firewall blocks remote access
• Wrong URI

This guide also covers

• milvus connection refused
• milvus connect timeout 19530

The same problem in other apps

All not loading, error messages & connection guides →

• Pinecone 429 Too Many Requests Error (Pinecone)
• Weaviate Error: Vector Lengths Don't Match (Weaviate)
• Qdrant "Wrong input: Vector dimension error: expected dim, got" (Qdrant)
• Chroma "Your system has an unsupported version of sqlite3" Error (Chroma)

Other Milvus errors

• Milvus "collection not loaded" Error
• Milvus Query Node Out of Memory (OOM)
• Milvus "field dimension mismatch" Error
• Milvus etcd and MinIO Dependency Errors
• Why Is Milvus Search Slow?
• Milvus "index not exist" Error
• Milvus Search Returns Empty Results After Insert
• How to Cancel Zilliz Cloud (Milvus) Subscription