After install nothing happens in the UI

[eliassal]

I followed instructions "Running with built in server", I did "npm run start", and have on the command line

elasticsearch-head@0.0.0 start /home/salam/elasticsearch-head-plugin/elasticsearch-head
grunt server
Running "connect:server" (connect) task
Waiting forever...
Started connect web server on http://localhost:9100

I browsed(used Chrome, Firefox) to localhost:9100, UI is displayed but nothing happens I click on "Connect with the right url to elasticsearch at 9200 then "Indices" nothing happens
When I visit http://myserver2k8:9200/ I get right information

name "puppetCentos2k8"
cluster_name "elasticsearch"
cluster_uuid "2ILAGt5pQj6k9uXyNiI6wQ"
version
number "8.5.2"
build_flavor "default"
build_type "tar"
build_hash "a846182fa16b4ebfcc89aa3c11a11fd5adf3de04"
build_date "2022-11-17T18:56:17.538630285Z"
build_snapshot false
lucene_version "9.4.1"
minimum_wire_compatibility_version "7.17.0"
minimum_index_compatibility_version "7.0.0"
tagline "You Know, for Search"

[eliassal]

At the end of install step, I see
added 525 packages from 631 contributors and audited 527 packages in 30.75s

can this be the issue not making head working correctly?

[eliassal]

Also, beside connect, I see always "cluster Health: Not connected", I click on it nothing happens even no error messages