I am using Search API Solr (Version: 7.x-1.14), and search was working fine but has stopped working. I now see "The Solr server of Solr could not be reached" at admin/config/search/search_api. In the past, when I have gotten this message, it was because solr had stopped running. In this case, solr is running. I have confirmed this with the "bin/solr status" command.
My settings should all be fine, since they have not changed and were working fine before:
Solr Host: localhost Solr port: 8983 Solr path: /solr/drupal
What could cause Drupal to now be unable to reach solr when no settings have changed and solr is running?