HI I am using HDP2.5 sandbox, when I try to accces audit logs I get error "Unable to connect to audit store".
all other ranger-other-audit.jpg, tabs/fuctions are working fine except this audit-access logs.
Also, solr and ambari-infra services are running.
Check the audit properties in ambari/ranger config. Also see if there are any errors during ranger startup.
Take a look at this tutorial - https://hortonworks.com/tutorial/tag-based-policies-with-apache-ranger-and-apache-atlas/ to confirm your steps. If you still see that message, check http://sandbox.hortonworks.com:8886/solr/#/~cloud to confirm you have a ranger_audits collection.
If you don't see it, I recommend restarting the Ambari Infra service. After you see the collection in Solr, you should see the audit logs: