2025-03-10 15:28:06 +01:00

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---
title: 'Traefik InFlightConn Middleware - TCP'
description: "Limiting the number of simultaneous connections."
---
To proactively prevent Services from being overwhelmed with high load, the number of allowed simultaneous connections by IP can be limited with the `inFlightConn` TCP middleware.
## Configuration Examples
```yaml tab="Structured (YAML)"
# Limiting to 10 simultaneous connections
tcp:
middlewares:
test-inflightconn:
inFlightConn:
amount: 10
```
```toml tab="Structured (TOML)"
# Limiting to 10 simultaneous connections
[tcp.middlewares]
[tcp.middlewares.test-inflightconn.inFlightConn]
amount = 10
```
```yaml tab="Labels"
labels:
- "traefik.tcp.middlewares.test-inflightconn.inflightconn.amount=10"
```
```json tab="Tags"
// Limiting to 10 simultaneous connections
{
//..
"Tags" : [
"traefik.tcp.middlewares.test-inflightconn.inflightconn.amount=10"
]
}
```
```yaml tab="Kubernetes"
apiVersion: traefik.io/v1alpha1
kind: MiddlewareTCP
metadata:
name: test-inflightconn
spec:
inFlightConn:
amount: 10
```
## Configuration Options
| Field | Description | Default | Required |
|:------|:------------|------------------|-------|
| `amount` | The `amount` option defines the maximum amount of allowed simultaneous connections. <br /> The middleware closes the connection if there are already `amount` connections opened. | "" | Yes |