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December 2007 - Posts

Monday, December 31, 2007 5:00 AM

Mapping Credentials to Authentication Schemes

You may have noticed that an HTTP binding is configured with an HttpClientCredentialType whereas an HTTP binding element is configured with an AuthenticationScheme. How are these two settings related? If you want to switch between a custom binding and
Posted by Nicholas Allen | 3 Comments
Friday, December 28, 2007 5:00 AM

Controlling HTTP Connection Limits

I need to make many simultaneous HTTP calls to the same service from my client application. How do I increase the limit on the number of HTTP connections? This setting isn't available on any of the bindings or binding elements but the default limit can
Posted by Nicholas Allen | 3 Comments
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Thursday, December 27, 2007 5:00 AM

Cleaning up Async

There needs to be some concept of cleanup that takes place when an asynchronous request can't be completed. For example, when a service is shut down or a socket is closed you know that any asynchronous operation waiting on that resource will never get
Posted by Nicholas Allen | 1 Comments
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Wednesday, December 26, 2007 5:00 AM

Sharing Contracts Across Services

I've deployed several services that share some of their data contracts. When I build a client application that calls more than one of the services, each service contributes a copy of the data contract during proxy generation. This causes a compile error
Posted by Nicholas Allen | 3 Comments
Friday, December 21, 2007 5:00 AM

2007 Year in Review

The year in review comes at the end of December rather than the beginning of January this year. Another year has gone by, with 250 articles posted so far (exactly as many as were posted during all of last year). Counting today and four more to come by
Posted by Nicholas Allen | 1 Comments
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Thursday, December 20, 2007 5:00 AM

Session Security

How often does authorization occur? Authorization is typically scoped to either messages or sessions. When authorization is scoped to messages, then an authorization request occurs each time a message is sent. When authorization is scoped to sessions,
Posted by Nicholas Allen | 1 Comments
Wednesday, December 19, 2007 5:00 AM

Windows and UPN Format Credentials

There are many different formats for representing an identity. Some of the popular styles are distinguished names (CN=Name,OU=Users,DC=Domain), Windows (Domain\Name), and user principals (Name@Domain.com). The style you choose when setting the ClientCredentials
Posted by Nicholas Allen | 1 Comments
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Tuesday, December 18, 2007 5:00 AM

Concurrent Channel Performance

Being thread-safe is different than being concurrent. The channel interfaces are thread-safe so that multiple callers can use them at the same time without getting garbled messages. However, if multiple callers try to send messages on a single channel
Posted by Nicholas Allen | 1 Comments
Monday, December 17, 2007 5:00 AM

Understanding MustUnderstand

The MustUnderstand attribute is frequently misunderstood because people assume that it must be much more complex and powerful than it really is. I explained the mechanics of using MustUnderstand last year but today's article is about some of the misconceptions
Posted by Nicholas Allen | 1 Comments
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Friday, December 14, 2007 5:00 AM

Printing Flexible Message Headers

When a message header supports multiple representations, which version is used when the message header is printed? A message header is a piece of data about the message that's carried on the wire somewhere apart from the message contents. When using an
Posted by Nicholas Allen | 1 Comments
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Thursday, December 13, 2007 5:00 AM

Collections without CollectionDataContract

In the article about serialization conflicts , one of the points mentioned was that CollectionDataContract doesn't let you add non-default data members. How do I format a collection that contains data members? CollectionDataContract is automatically being
Posted by Nicholas Allen | 3 Comments
Wednesday, December 12, 2007 5:00 AM

TCP Keep Alive

How do I detect when the other side of a TCP connection has gone away? Does TCP keep-alive take care of this for me? Although we take it for granted that change can be quickly detected for closely connected components, it turns out to be surprisingly
Posted by Nicholas Allen | 9 Comments
Tuesday, December 11, 2007 5:00 AM

Resolving Conflicts in Serialization

DataContractSerializer supports multiple serialization mechanisms. If more than one serialization mechanism is specified for the same type, which one gets used? Experimentation is the easiest way to figure out what happens. I'll look at different combinations
Posted by Nicholas Allen | 2 Comments
Monday, December 10, 2007 5:00 AM

Deriving from Bindings

When packaging up a collection of settings, how do I know whether to use a CustomBinding, extend the Binding class, or extend one of the standard binding classes? In most cases this should be easily decidable by asking at most two questions. The first
Posted by Nicholas Allen | 1 Comments
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Friday, December 07, 2007 5:00 AM

Localhost Common Name

What CN should I use when issuing a test certificate for a service? There are three types of names you'll commonly see: fully qualified domain names machine names (netbios) localhost These names are what work when connecting at internet, intranet, and
Posted by Nicholas Allen | 1 Comments
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Thursday, December 06, 2007 5:00 AM

Silent Security Failures

I'm using reliable messaging and getting an exception that the reliable session has faulted. It's the first exception that I see so I don't know why the session faulted. How do I know what went wrong? Here's the full error message: The underlying secure
Posted by Nicholas Allen | 1 Comments
Wednesday, December 05, 2007 5:00 AM

Detecting Metadata

How do I figure out during dispatch whether a request is destined to be a metadata request or a normal application request? The reason you might care whether a request in flight is for metadata or not is because of security policy. You might want to permit
Posted by Nicholas Allen | 1 Comments
Tuesday, December 04, 2007 5:00 AM

Shutting Down Service Hosts

How should I shut down a running service host? Here's a variety of attempts at answering the same question, with varying levels of sophistication thrown into the mix. Way Too Simple Always call abort, it's guaranteed to shut things down. This is the equivalent
Posted by Nicholas Allen | 5 Comments
Monday, December 03, 2007 5:00 AM

Future of Silverlight

Late last week Scott Guthrie announced some of the plans for the next version of Silverlight . In addition to being renamed from Silverlight 1.1 to Silverlight 2.0 and getting a beta date for Q1 of next year, here were the big new features announced.
Posted by Nicholas Allen | 3 Comments
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