I'm having the same issue. The tools.proxy.base configuration does not seem to be working as it always points to 127.0.0.1:8000, it does not matter what I add as a base. tools.proxy.on = <boolean>
* Whether or not the Splunk platform instance is behind a reverse proxy server.
* If set to "true", the instance assumes that it is behind a reverse proxy and
uses HTTP header information from the proxy to log access requests, secure
its cookies properly, and generate valid URLs for redirect responses.
* All of the instance's HTTP services will use information from
"X-Forwarded-*", "Front-End-Https", and "X-Url-Scheme" headers, where
available, to override what it receives from proxied requests.
* If you set this to "true", you must also set 'tools.proxy.base' to a valid
host name and network port.
* If set to "false", the instance relies on its own internal HTTP server
settings and the immediate client's HTTP headers for the information needed
for access request logging, cookie securing, and redirect URL generation.
* Default: false
tools.proxy.base = <scheme>://<URL>
* The proxy base URL in Splunk Web.
* Default: empty string
... View more