Sharing Ports Between Services in Visual Studio .NET

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Sharing Ports Between Services
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Internet Information Services 60 (IIS) and later provides a way to share ports across multiple processes The actually mechanism that is responsible ) This is a kernel-mode for sharing ports is the new HTTP service ( service that does connection management for both IIS and self-hosted WCF services This approach works well for services that use the HTTP transport protocol and is transparent across hosting environments WCF provides the NetTcp Port Sharing Service Windows Service to facilitate port sharing for TCP connections By default this service is disabled Figure A1 shows how to start the NetTcp Port Sharing Service from the command line
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Figure A1 Starting NetTcp Port Sharing Service from command line
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Port sharing can be enabled on a binding after the port sharing service is started Listing A2 shows how to enable port sharing using con guration
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Listing A2 Enabling Port Sharing in Configuration
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Listing A3 shows how to enable port sharing using code
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Listing A3 Enabling Port Sharing in Code
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Configuring Service Quota Settings
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Microsoft products ship with a secure by default approach This includes WCF, which means that various settings within WCF are set to prevent attacks such as denial-of-service attacks Microsoft chose the default values
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Appendix: Advanced Topics
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for many of these settings based on a single machine development environment This means that some of the default settings may need to be changed for use in a production environment One set of default settings that may need changing are those set by the behavior This behavior limits the amount of resources consumed by placing quota limits on services This behavior , , has three settings: Table A1 lists the properties of the and behavior along with their default values
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Table A1 Setting
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Properties Description Default Value
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Limits the total number of simultaneous calls that will be processed Limits the maximum number of concurrent sessionful channel connections to a service Limits the maximum number of concurrent instances to a service
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Both the and the have default values that can potentially limit the throughput in a production environment You will want to adjust these settings if your services need to accept more throughput and your servers have resources available to handle the additional load Just be aware of the potential impact these settings have on denial-of-service attacks Listing A4 shows how to adjust these settings using con guration
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Listing A4 Adjusting in Configuration
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Listing A5 shows how to adjust the settings using code
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Listing A5 Adjusting in Code
Configuring HTTP Connections
The HTTP 11 speci cation includes a feature called HTTP Keep-Alives HTTP Keep-Alives allow for HTTP connections to be persisted connections between clients and servers This allows clients to keep connections open so that they can be reused for subsequent requests To limit the resources used by a single client, the HTTP 11 speci cation speci es a maximum of two connections per server from an application By default, HTTP clients in the NET Framework use HTTP 11 Keep-Alives including WCF binding element leverages classes The namespace for managing and making HTTP found in the binding element uses the requests The class to make HTTP requests The class and , to manage uses other classes, HTTP connections These classes help manage HTTP connections including
Appendix: Advanced Topics
connection lifetime This section looks at how to manage HTTP connections to get the best performance and scalability for WCF services
Recycling Idle Connections The property on the class speci es the time that connections can remain idle before they are closed Each new instance has a default value of 100 seconds This is based on the property of the class Adjusting this property is especially useful when load balancing services across a farm of servers Setting this value lower increases the likelihood that idle connections will be recycled This allows for clients to establish new connections to other servers within the load-balanced server farm property on the Listing A6 shows how to adjust the class
Listing A6 Setting for HTTP Using Code
Adjusting Connection Lifetime The property on the class speci es the maximum time a connection can remain active before it is eligible for instance has a default value of 1 A recycling Each new value of 1 means that connections can remain open inde nitely This may not be desirable in load-balanced server farms because clients stay connected to the same server Connections can be recycled after a period of to a value greater than 0 For time by setting the is checked If the conneceach new request, the tion lifetime has elapsed, the active connection closes and a new connection is created Connections can be forced to be closed after each request by setto 0 Listing A7 shows how to adjust the ting the on the class