DAP4 in TDS dap4.core.util.DapException: Resource root not found about thredds HOT 3 OPEN

It is going to be tough for me to debug a foreign server. Have you contacted the
server's owner to see how they have configured the DAP4; specifically, what is
in /WEB-INF?

from thredds.

Hi Dennis! Thank you for the prompt reply. I am the owner :).
WEB-INF (in webapps/thredds/) has a lot of stuff that came from the official .war and has not been changed since then.
The only reference to dap4 is in catalog.xml:

  <service name="all" base="" serviceType="compound">
    <service name="odap" serviceType="OpenDAP" base="/thredds/dodsC/" />
    <service name="dap4" serviceType="DAP4" base="/thredds/dap4/" />
    <service name="http" serviceType="HTTPServer" base="/thredds/fileServer/" />
    <service name="wms" serviceType="WMS" base="/thredds/wms/" />
    <service name="ncss" serviceType="NetcdfSubset" base="/thredds/ncss/grid/" />
  </service>

Other services (odap, http, wms, and ncss) work fine.

from thredds.

Hi,
Just an update. The latest THREDDS Data Server [Version 4.6.16.1 - 2021-02-23T15:50:43-0700] still has the same issue.
Thank you!

from thredds.