dmitri maziuk created SOLR-18132:
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             Summary: SSL and external zookeeper 
                 Key: SOLR-18132
                 URL: https://issues.apache.org/jira/browse/SOLR-18132
             Project: Solr
          Issue Type: Bug
    Affects Versions: 9.10.1
            Reporter: dmitri maziuk


In a 9.10.1 cluster with external zookeeper, SSL enabled for Solr but not for 
ZK inter-node communication:
 * Admin UI "Cloud" section works
 * Configset API work
 * Enabling auth via CLI works

Collection creation fails with unhelpful "IOException" talking to the nodes.

Turning SSL off fixes that.

The bug is that if SSL is an all-or-nothing proposition, it should fail right 
away for *all* ZK communications and not "work up to a point" like it does now.

Preferably, of course, it should work with SSL enabled for Solr but not for ZK: 
the cluster lives in its own sandbox and does not really need SSL internally. 
SSL is enabled only because authentication is enabled on client connections to 
Solr nodes and sending unencrypted creds is bad for security audits.



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