Sounds like your Solr was restarted as a SolrCloud, maybe by an automated script or an init service?
If you created a core in a standalone mode and then restart the same configuration in a SolrCloud mode, it would know that you have those collections/cores, but will not be able to find any configuration files (because it will expect them in ZooKeeper, not on disk). So, that would explain the error. I would focus on the restart point, maybe check the logs (in server/logs) and see if there are hints there. Regards, Alex. P.s. Unless you are able to see the SolrCloud from one computer and Solr from another at the same time/back-and-forth. That would indicate some sort of proxy/routing and then I would look at the Overview page system variables to confirm the directories/options. But that's kind of a distant second possibility. On 18 September 2018 at 14:23, Gu, Steve (CDC/OD/OADS) (CTR) <c...@cdc.gov> wrote: > I have set up my solr as a standalone service and the its url is > http://solr.server:8983/solr. I opened 8983 on solr.server to anyone, and > solr can be accessed from laptops/desktops. But when I tried to access the > solr from some servers, I got the error of SolrCore Initialization Failures. > The left nav on the page is shown but indicates that the solr is set up as > SolrCloud, which is not. > > I am really confused about this and have no idea how to tackle this problem. > Has anyone ever had a similar issue? Or any idea why this is happening? > > Thanks > Steve >