Hello @Girija    Since we haven't heard back from you, We shall mark the Post as Solved. If you happen to have any further ask, Feel free to Update the Post. In Summary, Internally, I wasn't able to replicate the issue being faced by you as I was able to create the ConfigSet using "_default" ConfigSet as baseConfig.  Customer can use the below solrctl command to create a ConfigSet with Solr KeyTab: solrctl config --create Test_Config _default -p configSetProp.immutable=false Assuming the above Command fails, Running the solrctl command with "--trace" after "solrctl" & before "config" would print the trace logging & assist in troubleshooting the issue faced by your team.    Regards, Smarak ... View more