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Monitoring performance counters

Published: November 15, 2009

Updated: February 1, 2011

Applies To: Forefront Threat Management Gateway (TMG)

The Dashboard tab provides a quick view of Forefront TMG performance counters. During Forefront TMG installation, Performance Monitor is installed, providing a customized view of the Windows Performance Monitor that contains only Forefront TMG counters.

This topic contains some suggestions regarding which performance counters to monitor for load monitoring and security monitoring.

To use the Performance Monitor

  1. Click Start, click Microsoft Forefront TMG, and then click Forefront TMG Performance Monitor.

  2. In the Reliability and Performance Monitor, a number of default counters appear. The following table lists these counters, and their general usage.

     

    Category Performance counter name Usage

    Forefront TMG Firewall Packet Engine

    Active Connections

    The total number of active connections currently passing data. Use this counter to monitor general performance.

    Forefront TMG Firewall Packet Engine

    Bytes/sec

    Total throughput in bytes per second passing through the firewall. Every byte is counted twice: once when it enters the firewall, and once when it leaves the firewall. Use this counter to monitor general performance.

    Forefront TMG Firewall Service

    Active Sessions

    The number of active sessions for the Firewall service. Use this counter to monitor general performance. By comparing this counter at both peak and off-peak times, a good picture of routine usage can be built up.

    Forefront TMG Web Proxy

    Requests/sec

    The request rate each second. Use this counter to monitor general performance. Dividing the Client Bytes Sent/sec counter by this counter provides a measure of average response size, which should be no more than approximately 20 KB.

    Forefront TMG Firewall Packet Engine

    Dropped packets/sec

    The number of denied packets per second. Use to monitor general security threats. If numbers are large (more than 100), check for network configuration errors and attacks.

    Forefront TMG Firewall Packet Engine

    Packets/sec

    The number of allowed and denied packets per second. Use to monitor general security threats and performance. This directly impacts CPU utilization.

    Forefront TMG Firewall Packet Engine

    Connections/sec

    The number of TCP and UDP connections created per second. Use to monitor general security threats and performance. This directly impacts CPU utilization.

    Forefront TMG Web Proxy

    Average Milliseconds/request

    The average response time. Use to monitor general security threats and performance. Use direct fetches and cache fetches to diagnose.

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