When you are using RfcOpenEx to open a connection to SAP system, the following error may return to your application.
group : 103
key : RFC_ERROR_LOGON_FAILURE
message : Timeout
You may also find the error below in RFC trace on external side.
>>> RfcOpenEx ...
>>> Timeout during logon check
<<< RfcOpenEx failed
Classic RFC library as of Release 6.20
RFC library, RfcOpenEx, timeout during logon check, JP1, Power Center, Job, system design , KBA , BC-MID-RFC-SDK , NetWeaver RFC SDK , BC-CST-DP , Dispatcher, Task Handler , Problem
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