The user might see a Server Error 500 while trying to connect to SVN to use the VCS feature in TIBCO Data Virtualization. 

The error gets logged in the cs_studio.log and not in the cs_server.log or any of the server logs. Below is the stack trace from cs_studio.log:
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INFO 2022-08-09 12:39:56.304 -0700 Application - Internal warning: Application.makeBusy(): busy count less than zero
INFO 2022-08-09 12:39:56.305 -0700 VcsHelper - showErrorMessage:Manage Connection - Invalid Connection: Verification failed
INFO 2022-08-09 12:39:56.305 -0700 VcsHelper - showErrorMessage
java.lang.Exception: Server Error 500 (Response parsing error: Error reading entity from input stream.)
        at com.compositesw.ui.modeler.VCS.REST.Proxy.VcsConfigurationRestProxy.readVerifyVcsConnectionResponse(VcsConfigurationRestProxy.java:276) ~[csstudio.jar:?]
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This article discusses the reason for the 'Server Error 500' a user may get while using the VCS feature in the TIBCO Data Virtualization.

Windows operating system

TIBCO Data Virtualization's SVN native library has dependencies on the Visual C++ 2013 version. This is a prerequisite if the TIBCO Data Virtualization Server is running on the Windows operating system.

If the user's TIBCO Data Virtualization server is hosted on a Windows machine and does not have Visual C++ 2013 version, the user will have to download and install the 2013 VC redistributable at their end using the links mentioned in the reference to get rid of the error and use the VCS functionality.

https://www.microsoft.com/en-in/download/details.aspx?id=40784
https://www.microsoft.com/en-in/download/confirmation.aspx?id=40784