The performance of the Forefront UAG server can be affected by the performance of resources on the servers. As and when required, you should compare collected performance monitor information against baseline information in order to analyze the performance of the Forefront UAG servers.

Check the following:

If System Center Operations Manager 2007 is deployed, you can use the Forefront Unified Access Gateway (UAG) System Center Operations Manager (SCOM) Management Pack (version 4.0.1095.0) to monitor performance on Forefront UAG servers. For more information, see System Center Operations Manager 2007 (http://go.microsoft.com/fwlink/?LinkId=183514).

For more information about the Forefront UAG System Center Operations Manager (SCOM) Management Pack (version 4.0.1095.0), see Using System Center Operations Manager (SCOM).