CommunicationException with 'not recognized sequence' message in WCF

守給你的承諾、 提交于 2019-11-30 03:04:06

问题


I get a CommunicationException while using WCF service. The message is:

The remote endpoint no longer recognizes this sequence. This is most likely due to an abort on the remote endpoint. The value of wsrm:Identifier is not a known Sequence identifier. The reliable session was faulted.

The exception is thrown in a moment after a contract method was called. Before calling contract method the channel state is Opened. I restore my service client after catching this exception and for some time it works fine. But then this error occures again. It seems like some timeout is exceeded, but I can't understand which one exactly.

I use wsHttpBinding with reliableSession enabled. The InactivityTimeout is set to half an hour and I'm sure it's not exceeded, because exception is thrown earlier.


回答1:


I solved the problem. The reason was RecieveTimeout on a server side. It was set to 1 minute, so after having no requests during 1 minute server used to close a channel, and when client tried to call a contract, channel was already crashed due to the timeout.

I found the solution after reading this article:

http://msdn.microsoft.com/en-us/library/system.servicemodel.reliablesession.inactivitytimeout.aspx




回答2:


I received this error while setting up a new WCF service which returned a list of objects.

My understanding is that WCF services can only pass very simple objects back n forth.

So objects with anything other than public properties will not be transferable.

The object had a read only property doing a bit of logic.

Once I got rid of this, rebuilt, and updated the web references, the error went away.




回答3:


Tip: If you're returning a object and it has properties check the gets and sets of each one. We had a problem around it.




回答4:


I have seen this happen when an application pool gets recycled.

Look at the very last section of this blog about service recycling .



来源:https://stackoverflow.com/questions/2652601/communicationexception-with-not-recognized-sequence-message-in-wcf

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