I was having some issues today with a WS Federation implementation using a passive STS. I was logging onto the STS but when the browser redirected back to the client after a login, the client rejected the token and redirected me back to the STS again. There was no error message and after searching online… Read More »
Sometimes it can be a real nightmare to troubleshoot for what reason an application are unable to connect to WCF services. The client simply gets a “Connection refused”, “Connection aborted” or “Timeout” message back.
Please see the article on how to install powershell on a azure virtual machine as a prerequisite to this article. This short article will demonstrate how to connect to your azure subscription from powershell.
In the next few steps i will show how to install azure powershell on an azure virtual machine.
I wrote this wcf connection test utility because sometimes you need to configure and troubleshoot different service setups and just need a quick utility to answer the question is the service there and can you connect to it?
So you have decided for some reason to host your WCF services with a net.tcp binding in IIS and for some reason the services timeout, becomes unresponsive or unreachable some times? It turns out this is a known Microsoft bug and the fix can be found here.
Above is the life cycle of a queued message in a transactional queue and the relevant components. I will explain it below.
Check the SPNs of the client end point inside the wcf configuration file. Make sure that the destination endpoint is defined correctly. This can be caused by requiring kerberos authentication where is it not possible. In this case make sure that allowntlm is enabled for the particular service. Keep in mind that Kerberos caches the SPN… Read More »
The post will show the configuration needed to enable net.tcp transport security with impersonation for WCF.
When it comes to securing WCF security it comes down to Message security or Transport security. There are hybrid approaches of the two but they are not often used. The type of security to use can also be influenced by the binding that will be used.
In this post I will explain at high level the concept of policy based configuration and I will be providing a POC. Anyone that has ever worked with WCF in a proper scaled application with many many micro services must know about the pain of maintaining the configuration files, I am now not only referring to… Read More »
WCF provides the developer with the means of extending the service model through the use of behaviors. The behaviours get defined by four interfaces types. IServiceBehavior, IEndpointBehavior, IContractBehavior and IOperationBehavior. All of these interfaces follow the same template which allows the developer to inject, alter or validate values before dispatching a call. The order in which the methods are called is Validate, ApplyDispatchBehavior and… Read More »
The following example uses an active security token service (A-STS) that issues tokens using the WS-Trust standard. The type of STS discussed in this post is called a Active STS OR A-STS, it refers to the client that is actively in control of its own authenticated state. This client will typically have its own login window build into the… Read More »
As I stated earlier in a post; “WCF is version tolerant it does not have specific version support. It will adjust the data contracts according to what the client and service is expecting.” The IExtensibleDataObject is the key to have version tolerance. The Microsoft site states the following about this interface. The IExtensibleDataObject interface provides a single… Read More »
How do you know if a WCF service is up and running if all you have is the channel and you don’t actually have access to the real proxy? The ICommunicationObject Interface provides you with a solution for this exact problem as it provides the developer with a abstract way to open, close and check the state of connections.