Getting "Unrecognized error 109 (0x6d)" which can be "fixed" by changing web.config

I have a WCF service hosted in IIS using WAS. When I try to access this service using a net.tcp binding I get the following error:

There was an error reading from the pipe: Unrecognized error 109 (0x6d).

When using basicHttp I do not encounter the problem.

The strange thing is that I can "fix" the problem by randomly changing the web.config and saving it. The problem just vanishes until I do an IISReset or an Application Pool Recycle. It is then broken again until I change (or just save) the web.config again...

• I have enabled tracing but that just gives the unrecognize error.
• Rebooting doesn't help.
• I have increased the thresholds in WCF but that didn't change anything.

The contract is really really simple with no complex types, so no serialization problems. The retu开发者_如何学Crn message size is a string of only 12 characters

Have a look at this...

https://learn.microsoft.com/en-ca/archive/blogs/joncole/smsvchost-exe-event-log-id-8-an-error-occurred-while-dispatching-a-duplicated-socket-this-handle-is-now-leaked-in-the-process

In my case restarting net tcp listener and port sharing service helped. The article has a nice overview of most likely causes too.

I have got the same error and found a solution to my case, try it out and check if it resolve yours.

In my case, there was a unrecognized data being passed through WCF. It was a enumerator that was not registered.

E.g (c#):

enum MyEnum { A = 1, B = 2 }

And then I use a MyEnum object with value 3 (any that dont exist in enum). So, WCF cant understand this value and gave me this error.

If you are using big messages you could try changing the transfer mode from buffered to streamed: http://msdn.microsoft.com/en-us/library/ms731913.aspx

It has solved our problems.

Regards

I received this error because I was returning a DataTable from my service call and I did not set the TableName property.