Tomcat 401 Unauthorized - Waiting for Appian component Search Server to be healthy...

Upgrading to Appian version 24.4 and cannot get the Tomcat server to initialize completely.

The following is a snippet from the tomcat-stdout.log:

"host [http://localhost:9200], URI [/], status line [HTTP/1.1 401 Unauthorized]
{"error":{"root_cause":[{"type":"security_exception","reason":"missing authentication credentials for REST request [/]","header":{"WWW-Authenticate":["Basic realm=\"security\", charset=\"UTF-8\"","ApiKey"]}}],"type":"security_exception","reason":"missing authentication credentials for REST request [/]","header":{"WWW-Authenticate":["Basic realm=\"security\", charset=\"UTF-8\"","ApiKey"]}},"status":401}"

.....

[wait-for-component] INFO  com.appiancorp.common.startup.WaitForStatefulComponents - Waiting for Appian component Search Server to be healthy...

I've ensured the apiKeys match in <APPIAN_HOME>/conf/custom.properties and <APPIAN_HOME>/search-server/conf/custom.properties as identified in KB-2227 regarding apiKey mismatch

Does anyone have any suggestions on what else I can look at?

Thanks!