c# create qr code with logo An increased load for the CAS in C#.NET

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An increased load for the CAS
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Figure 11-9 Using NetStat to check that static ports are in use.
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Web services URLs and load balancing
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CAS servers publish URLs to allow clients to connect to the various Web services used by Exchange. When you expose these services to the Internet, you typically place one or more CAS servers in an Internet-facing site (behind the perimeter network) and proxy the connections that come into these servers to other servers elsewhere within the organization. It might be convenient to use Windows NLB or another load balancer to create an array to handle a higher volume of connections than a single server can handle, and then the question of how to best publish the various URLs to allow internal and external connections to flow smoothly arises. The basic approach is to configure the URLs according to the guidelines presented in Table 11-5 and to follow these principles:
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1. Set the CAS AutoDiscoverServiceInternalURI to the FQDN of the load balancer. 2. Leave the Web Services InternalNLBBypass and OWA InternalURL set to the FQDN of
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the CAS server.
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Table 11-5 Configuring Web services URLs for load balancers
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/OWA /ECP /OAB /EWS
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Use CAS server or array FQDN Use FQDN of load balancer $null Use FQDN of load balancer Use FQDN of load balancer Use FQDN of load balancer Use FQDN of load balancer $null Use FQDN of load balancer $null Use FQDN of load balancer $null Use FQDN of load balancer $null
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/Microsoft-Server-ActiveSync Use FQDN of load balancer
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As always, some testing is necessary to ensure smooth handling of client connections should a CAS server in the array fail.
11
Virtual Directory
InternalURL
ExternalURL (Internet-facing Active Directory site)
ExternalURL (internal Active Directory site)
11 Client Access Server
Changes to facilitate SSL offloading
SSL offloading is a feature often performed by hardware devices to relieve the workload of SSL encryption and decryption from Web servers in high-demand environments. If you want to use SSL offloading, you have to turn off SSL on the Autodiscover and EWS virtual directories, because the traffic reaching these directories will be plain HTTP rather than HTTPS. Two steps must be taken in Exchange 2010 to turn SSL off for a virtual directory. First, SSL is disabled in Microsoft Internet Information Services (IIS). Second, the relevant web.config file must be edited to remove SSL. Exchange 2010 SP1 makes the task a lot easier by introducing the RequireSSL parameter for the cmdlets used to create and modify the virtual directories. These cmdlets are as follows :
New-WebServicesVirtualDirectory Set-WebServicesVirtualDirectory New-AutodiscoverVirtualDirectory Set-AutodiscoverVirtualDirectory
If the RequireSSL parameter is set to $True, the virtual directory only supports HTTPS traffic. If set to $False, it supports both HTTP and HTTPS. You do not have to modify IIS, because all the work is done through the cmdlets.
Domain controllers
Handling client connections requires a complex interaction among reverse proxy server, CAS, and domain controller and the root cause for poor responsiveness could be a problem with the domain controller. In situations where domain controllers have to service authentication requests from tens of thousands of incoming client connections, you need to pay attention to two specific aspects. First, it s important that you configure domain controllers with sufficient secure channels to be able to cope with the demand for client connections to be authenticated. The queue for authentication requests is governed by the MaxConcurrentAPI setting on domain controllers, and this might have to be adjusted from its default value of two to five or more to increase the ability of the domain controller to handle the demand for client authentications. See TechNet for details about how to make this adjustment. Second, Windows does not automatically load balance secure channels across available domain controllers and you might arrive at a situation where one domain controller is swamped by authentication requests and others are not busy.
The Microsoft Knowledge Base article at http://support.microsoft.com/kb/167029 explains how to use the Setprfdc utility to address the problem . See http://blogs.technet.com/b/ad /archive/2008/09/23/ntlm-and-maxconcurrentapi-concerns.aspx for an excellent blog post about the importance of setting the MaxConcurrentAPI parameter to handle authentication load .
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