NIS troubleshooting flow

Updated: February 1, 2011

Applies To: Forefront Threat Management Gateway (TMG)

This topic is designed to help you troubleshoot and resolve Network Inspection system (NIS) issues.

The following sections provide:

Procedures for troubleshooting NIS are provided in the following topics:

Prerequisites

To troubleshoot NIS issues, you must be familiar with the following Forefront TMG procedures:

Keeping NIS constantly updated with the latest known vulnerabilities signatures, which are provided by Microsoft Update. For information on the available update methods, see Planning for updates of protection definitions.
Checking whether NIS signatures are up to date. For information, see Managing NIS signatures.
Reviewing NIS policy. For information, see Enabling and configuring NIS.
Checking NIS alerts. In the Forefront TMG Management console, alerts are displayed on the Alerts tab of the Monitoring node. For information, see Monitoring alerts.

This flowchart guides you through the steps required for troubleshooting NIS.

NIS troubleshooting flowchart