When I check my SolrCloud nodes' log files (Solr 4.2.1) I get see that line at all of them:
INFO: [collection1] webapp=/solr path=/admin/file/ params={file=admin-extra.html&_=1368535805558} status=0 QTime=5 May 14, 2013 3:50:27 PM org.apache.solr.core.SolrCore execute INFO: [collection1] webapp=/solr path=/admin/luke params={numTerms=0&_=1368535805536&show=index&wt=json} status=0 QTime=1 May 14, 2013 3:50:27 PM org.apache.solr.core.SolrCore execute INFO: [collection1] webapp=/solr path=/admin/ping params={action=status&_=1368535805560&wt=json} *status=503* QTime=0 May 14, 2013 3:50:32 PM org.apache.solr.core.SolrCore execute INFO: [collection1] webapp=/solr path=/replication params={slave=false&command=details&wt=javabin&qt=/replication&version=2} status=0 QTime=0 /admin/ping listed as INFO however has a status 503? Does that status is HTTP status and what it means for me?