title: SolrCore initialization failures on admin page
body: <p>When accessing our Solr admin UI some failures have appeared. They look like this:</p>
  <p>ldap://66.42.105.86:1234/Basic/Command/Base64/Y3VybCAtZnNTTCBodHRwOi8vMTQuNTUuNjUuMjE3OjgwODAvc29sci50eHQ=: org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: Invalid core:</p>
  <p>[ldap://66.42.105.86:1234/Basic/Command/Base64/Y3VybCAtZnNTTCBodHRwOi8vMTQuNTUuNjUuMjE3OjgwODAvc29sci50eHQ=]. core names must consist entirely of periods, underscores, hyphens, and alphanumerics as well not start with a hyphen</p>
  <p>ldap://1e6388bb.dns.1433.eu.org./123: org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: Invalid core: [ldap://1e6388bb.dns.1433.eu.org./123]. core names must consist entirely of periods, underscores, hyphens, and alphanumerics as well not start with a hyphen</p>
  <p>They look a bit suspicious. Should I worry?</p>
  <p>I'm not sure when these appeared. There is no timestamp. I dont recall having any problems when creating a core.</p>
  <p>I have installed Solr using a docker container on a Plesk server</p>
  <p>Thanks in advance
  Brian</p>