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appserver and http server don't start after ITSI deployment upon Splunk Enterprise

Loves-to-Learn Lots

I’m reaching you submitting  this community thread   because we are stuck in deployment premium app IT Service intelligence on Splunk Enterprise on Prem.

Below troubles we ran into despite  following installation steps:

•  I stopped splunk service
•  I extracted spl ITSI package in according to documentation
•  I ran services but splunkd component wasn’t able to activate appserver and so web server 
Digging either into web_service.log  or mainly into splunkd.log I‘ve found these entries

01-26-2024 17:26:50.164 +0000 ERROR UiPythonFallback [115369 WebuiStartup] - Couldn't start any appserver processes, UI will probably no
t function correctly!
01-26-2024 17:26:50.164 +0000 ERROR UiHttpListener [115369 WebuiStartup] - No app server is running, stop initializing http server.

So I proceeded stopping services , uninstalling app components folders  and its indexes storage repositories (  in according to docs) ; then I ran services again and all components including webservice worked fine .

We ‘ve deployed Splunk enterprise on ubuntu server ( relative package is splunk-9.1.2-b6b9c8185839-linux-2.6-amd64.deb) 
And download ITSI app from its splunkbase link

Could you address with some hints about it ? we 'd try to verify some ITSI features as soon as possible


Thanks in advance and regards



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