Which connection type are you using for the remote server? SVN, SSH, HTTP, HTTPS?
Are there any error messages in the SAS Data Integration Studio client log file? On my machine that log file is in the directory %APPDATA%\SAS\SASDataIntegrationStudio\4.901\DataIntegrationStudio_Log.txt (e.g. C:\Users\USERID\AppData\Roaming\SAS\SASDataIntegrationStudio\4.901\DataIntegrationStudio_Log.txt). You should at least see the svn.exe command line printed with the connection data when you test it. e.g.
C:\Program Files\CollabNet\Subversion Client\svn.exe info --username user --password pass HTTPS://example.com:443/svn/reponame
What happens if you run the same svn command in a command window? Do you get any error messages printed there?