Overview of the Issue

NetScaler web application firewall (WAF) provides comprehensive protection for web applications from various threats and attacks. It is designed to secure applications against the OWASP Top Ten vulnerabilities and other potential security risks by inspecting both inbound and outbound traffic.

Setting up and fine-tuning AppFW rules requires a deep understanding of both the application and potential threats. Misconfigurations can lead to inadequate protection or unnecessary blocking of legitimate traffic.

Top Knowledge Content

Troubleshooting Common Problems

• Configuring the Web App Firewall

• Large Files upload Failure 

• High CPU

• High Memory

• NetScaler WAF learning functionality issues

• Configuring CEF logs - an open log management standard

• IP reputation

WAF Functionalities

• CTX568725 - Web Application Firewall is blocking a valid image upload

• CTX235668 - WAF Rules blocks traffic even though relaxation Rules are added

WAF Signature

• CTX492163 - Unable to update WAF Signatures "File too large"

• CTX138858 - Signature Auto Update Feature of Web Application Firewall

• CTX570604 - How to manually update Web Application Firewall Signatures

Tools and Resources

How to take trace packets on NetScaler to troubleshoot App Firewall issues

• Trace Log - Web App Firewall

FAQs

• FAQs and Deployment Guide

• Bot Management

This article provides a list of resources on how to Configure, investigate, troubleshoot, and prevent the most common issues with NetScaler AppFirewall.