It turns out, it has nothing to do with Windows Server. My problem is the same as this one: http://answers.splunk.com/answers/102567/c-sdk-builds-the-connection-was-closed-unexpectedly ... View more

Debug or Release mode made no difference to me. Both worked when ran from Visual Studio and both failed running on their own. I found a work around. I recompiled the SDK against .NET 4.5 and If I’m using a DEBUG version of my DLL and of the SplunkSDK.dll, it works without Visual Studio. ... View more

(Late comment) Depending on what you're trying to do, you could also use SEDCMD in props.conf to throw away the parts of the events that you don't want indexed. ... View more

Please Ignore this, the problem was not Splunk related. ... View more