I’m getting a SOAP exception telling: The header ‘OleTxTransaction’ from the namespace ‘http://schemas.microsoft.com/ws/2006/02/tx/oletx’ was

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Asked: May 23, 20262026-05-23T04:58:18+00:00 2026-05-23T04:58:18+00:00

I’m getting a SOAP exception telling: The header ‘OleTxTransaction’ from the namespace ‘http://schemas.microsoft.com/ws/2006/02/tx/oletx’ was

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I’m getting a SOAP exception telling:
“The header ‘OleTxTransaction’ from the namespace ‘http://schemas.microsoft.com/ws/2006/02/tx/oletx’ was not understood by the recipient of this message, causing the message to not be processed. This error typically indicates that the sender of this message has enabled a communication protocol that the receiver cannot process. Please ensure that the configuration of the client’s binding is consistent with the service’s binding. “

The method is defined as (by default has TransactionFlowOption.NotAllowed):

[OperationContract]  
Foo GetFoo(int fooId);

Other method in the same service is defined like:

[OperationContract]  
[TransactionFlowOption.Allowed]  
Foo GetFooTransactional(int fooId);

The first one would throw the exception when called within a WF TransactionScope activity, but not when calling it from a regular console application with a TransactionScope.

The second works in any case. I could just allow transactions in every method, but for several reasons I don’t want to do that.

I’m using named pipe bindings allowing transaction flow in clients and server.
Server:

<netNamedPipeBinding>
    <binding transactionFlow="true" transactionProtocol="OleTransactions" transferMode="Buffered" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" />
</netNamedPipeBinding>

Client:

<netNamedPipeBinding>
    <binding name="DefaultNamedPipeConfig" closeTimeout="00:01:00"
          openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
          transactionFlow="true" transferMode="Buffered" transactionProtocol="OleTransactions"
          hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288"
          maxBufferSize="65536" maxConnections="10" maxReceivedMessageSize="65536">
         <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
            maxBytesPerRead="4096" maxNameTableCharCount="16384" />
         <security mode="Transport">
             <transport protectionLevel="EncryptAndSign" />
         </security>
     </binding>
  </netNamedPipeBinding>