After publishing Exchange through the Forefront Unified Access Gateway (UAG) portal, you should make sure that it is sized correctly for your intended deployment.

The following tables provide the recommended settings that you should apply for Outlook Web Access (OWA) or Outlook Anywhere.

Configuration recommendations for OWA (without Outlook Anywhere)

Parameter and location Description Default value Recommended value Maximum value

Maximum connections

In the Forefront UAG Management console, next to Configure trunk settings, click Configure.

Configures the maximum number of connections to the Forefront UAG.

100,000

4*N

where N is the estimated number of concurrent users.

1,000,000

Maximum concurrent sessions

In the Forefront UAG Management console, next to Configure trunk settings, click Configure, and then on the Advanced Trunk Configuration dialog box, click the Session tab.

Configures the maximum number of concurrent sessions to the Forefront UAG.

100,000

4*N

where N is the estimated number of concurrent users.

1,000,000

Configuration recommendations for Outlook Anywhere

Parameter and location Description Default value Recommended value Maximum value

Maximum connections

In the Forefront UAG Management console, next to Configure trunk settings, click Configure.

Configures the maximum number of connections to the Forefront UAG.

100,000

30*N

where N is the estimated number of concurrent users.

1,000,000

Maximum concurrent sessions

In the Forefront UAG Management console, next to Configure trunk settings, click Configure, and then on the Advanced Trunk Configuration dialog box, click the Session tab.

Configures the maximum number of concurrent sessions to the Forefront UAG.

100,000

30*N

where N is the estimated number of concurrent users.

1,000,000

HKLM\SOFTWARE\WhaleCom\e-Gap\Von\UrlFilter\Comm\SSL\MaxSSLBuffers

Configures the maximum number of encrypted (TLS) buffers received from the back end server.

100,000

30*N

where N is the estimated number of concurrent users.

HKLM\SOFTWARE\WhaleCom\e-Gap\Von\UrlFilter\ConcurrentRequestsLimit

Configures the IIS to accept the required number of connections.

200,000

30*N + 50000

where N is the estimated number of concurrent users.

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