SAP Note 1664732 - CPI-C: Client with wrong appc header version rejected

Component : Low Level Layers -

Solution : https://service.sap.com/sap/support/notes/1664732 (SAP Service marketplace login required)

Summary :
This SAP Note addresses terminations in external programs using the CPI-C or RFC libraries, triggered by the "client with wrong appc header version rejected" error. The root cause is an incorrect merging of leftover data post-timeout due to a kernel bug, exacerbated by slow network conditions like VPN use. There is no workaround; the resolution involves updating to the latest versions of SAP .Net Connector or SAP Java Connector, or replacing the dynamically linked RFC library in relevant external applications.

Key words :
wrong appc header version rejected, symptom terminations occur, virtual private network, remaining data incorrectly, sap java connector, latest version, net connector, external programs, rfc library, fragmenting reason

Related Notes :

1671480SAP Java Connector Release 3.0.9
1651860SAP .NET Connector Version 3.0.6
413708Current RFC library