Please could you let me know is there any relation ship between Apache with Splunk GUI?
Not unless you have configured it that way.
(We have a reverse proxy which is integrated via GSS API to our AD domain to provide SSO access. )
Splunk itself has a built in webserver for its UI, that I'm pretty sure is not Apache based.
If running a standard Splunk installation it does not require or start any apache processes.
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