On Fri, Jul 9, 2021 at 9:33 PM GI D wrote: > Thanks Mark, > > This Jenkins installation is a straight-up copy of the current production > one that does not have any such plugin, and where this very test runs OK, > as I'm told. > > Thanks for clarification. That likely means that the Jenkins installation is not quite a complete copy of the current production one. For example, the current production one probably has an X server running and accepting requests on localhost. The new one either is not running an X server or is not accepting requests to the X server from localhost. An X server running and accepting requests is not really something that Jenkins provides (at least not without the Xvnc or Xvfb plugins), but seems like it must exist on the production server (or those requests would not be satisfied).
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