assuming each log is a different application, use some regex to pull the filename from the source field to a new field then use eval or a lookup to give more friendly application names.
https://answers.splunk.com/answers/268995/how-to-extract-filename-form-source-field.html
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In the gui, look at Settings > Server settings > General Settings and make sure the Splunk Server Name and the Default Host Name are correct.
if you have command line access, you can try using btool and locate the old server name:
$SPLUNK_HOME/bin/splunk btool server list --debug
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Try opening a port in the system firewall
sudo ufw allow 8000/tcp
or disable it altogether if your security policy allows:
sudo ufw disable
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