This document outlines the limits and constraints for Azure Application Gateway. Understanding these limits is crucial for designing and deploying scalable and reliable solutions.
These limits apply to most Application Gateway configurations.
| Feature | Limit | Notes |
|---|---|---|
| Maximum number of Application Gateway instances | 100 | Per subscription |
| Maximum number of backend pools | 400 | |
| Maximum number of backend HTTP settings | 400 | |
| Maximum number of listeners | 400 | |
| Maximum number of rules (Request Routing Rules) | 400 | |
| Maximum number of SSL certificates | 100 | Per Application Gateway instance |
| Maximum size of request header | 8 KB | |
| Maximum size of response header | 8 KB | |
| Maximum size of URL | 2048 characters |
The following table details limits that vary based on the Application Gateway SKU (Standard_V2, WAF_V2).
| Feature | Small | Medium | Large |
|---|---|---|---|
| Throughput (Gbps) | 1 | 4 | 10 |
| Connections per second | 2500 | 10000 | 25000 |
| Concurrent connections | 100000 | 200000 | 500000 |
| Feature | Small | Medium | Large |
|---|---|---|---|
| Throughput (Gbps) | 0.5 | 2 | 5 |
| Connections per second | 1250 | 5000 | 12500 |
| Concurrent connections | 50000 | 100000 | 250000 |
These limits apply specifically to WAF-enabled Application Gateways.
| Feature | Limit | Notes |
|---|---|---|
| Number of custom rules | 1000 | Per Application Gateway |
| Number of managed rule sets | 1 | For OWASP rule sets. You can enable specific rule groups. |
| Maximum size of request body | 2048 KB | Configurable up to this limit |
| Maximum file upload size | 100 MB | Configurable up to this limit |