SAP .NET Connector 3.0 Error: “client with wrong appc header version rejected”

Question

I am in the process of upgrading our software to use the SAP .NET Connector 3.0 (from the .NET Connector 1.0). All of the function calls are executed successfully, however, periodically we get the following error that is repeated 4 times:

Unhandled Exception: SAP.Middleware.Connector.RfcCommunicationException:

LOCATION CPIC (TCP/IP) on local host with Unicode

ERROR client with wrong appc header version rejected

TIME Fri Aug 17 09:40:35 2012

RELEASE 720

COMPONENT CPIC (TCP/IP) with Unicode

VERSION 3

RC 246

MODULE r3cpic.c

LINE 8554

DETAIL client version 6, gateway version 120 (xxx.xx.x.xx/3301)

COUNTER 2

The stack trace for this error is:

at SAP.Middleware.Connector.CpicConnection.CpicReceive(Int32 timeout)

Immediately after that error another error is thrown 4 times:

destination x failed when calling RFC_METADATA_GET -- see log for details

The stack trace for this error is:

at SAP.Middleware.Connector.RfcRepository.Execute(RfcFunction function)

The error does not seem to be related to any particular function call but, rather, it occurs periodically (approx. 20-30 minutes at present) for any of them.

The version of the DLLs that I am using are as follows:

sapnco.dll 3.0.2.0

sapnco_utils.dll 3.0.2.0

I am afraid that I don't really know my way around the new .NET Connector yet and would be very grateful if anyone had any thoughts, clues or suggestions.

Yours,

David

Answer 1

I've also had problems (albeit not the same one) using version 3.0.2.0 of the .NET Connector.

I believe there is now version 3.0.6.0 or higher, so try and get hold of this. There are a number of confirmed bugs in version 3.0.2.0, one of which is something do to with the connection pooling, I believe. This may be indirectly causing your problem.

I was going to point you in the direction of the SCN, but I see you've already found it - see the last response to my question slightly under yours indicating the above.