Due to the possible government shutdown the NIST GVT tool may not be available. In addition, NIST staff will not be available to respond to questions/issues on the Google Group. At this time, NIST has not been given notice of the server availability.
A locally executable version of the tool is provided as either a .war file or docker image, along with installation instructions, on the Documentation tab under Validation Tool Downloads.
If the NIST site is down, you can also obtain a docker image of the tool (and installation instructions) from GitHub:
https://github.com/usnistgov/gvt-resource-bundle/tree/develop/src/main/resources/Documentation/Downloads/app/docker