I moved my Retain 4 system to another server. Now when I search for messages, nothing happens. When I look at the RetainServer log, I see a lot of "401 Unauthorized" errors and it does not appear that the Indexer is running.
The customer failed to copy files from .../RetainServer/WEB-INF/solrweb/WEB-INF/cfg to the new server. Once he stopped tomcat, copied those files, and started tomcat again, the Indexer began working.
This article was originally published in the GWAVA knowledgebase as article ID 2735.