Book Image

Troubleshooting NetScaler

By : Raghu Varma Tirumalaraju
Book Image

Troubleshooting NetScaler

By: Raghu Varma Tirumalaraju

Overview of this book

NetScaler is a high performance Application Delivery Controller (ADC). Making the most of it requires knowledge that straddles the application and networking worlds. As an ADC owner you will also likely be the first person to be solicited when your business applications fail. You will need to be quick in identifying if the problem is with the application, the server, the network, or NetScaler itself. This book provides you with the vital troubleshooting knowledge needed to act fast when issues happen. It gives you a thorough understanding of the NetScaler layout, how it integrates with the network, and what issues to expect when working with the traffic management, authentication, NetScaler Gateway and application firewall features. We will also look at what information to seek out in the logs, how to use tracing, and explore utilities that exist on NetScaler to help you find the root cause of your issues.
Table of Contents (17 chapters)
Troubleshooting NetScaler
Credits
Notice
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Troubleshooting


AppFirewall is powerful, but not necessarily plug and play as we discussed. Issues with AppFirewall arise in the form of applications failing when the feature is turned on.

Identifying application Firewall blocks

It is important to know how to tell if the application is failing because AppFirewall is blocking it. There are several ways to identify if this is the case:

  • Under the Profile settings, you can configure an error object that can be useful when a User calls in to the helpdesk with an application access issue caused by AppFirewall blocking the request:

    You can configure this text under Application Firewall | Profile | Profile Settings.

  • If you are looking at a trace taken on NetScaler or on the User's PC where a HTTP request is being reset, look for the window code. In the following screenshot, that window code is 9845:

    9845 means the reset has been sent because an AppFirewall protection policy has been triggered.

  • If you have set up your profile for troubleshooting that is...