Neo4j Installation on "Red Hat Enterprise Linux Server 7.9 (Maipo)

I currently have Neo4j community Edition Version 4.3.5 installed on the server. When started, connectivity to the application through the browser is successful but there is only a blank page showing.

I tried to re-install neo4j following the steps found on this link Neo4j RPM Packages but I keep getting this error message:

curl: (7) Failed connect to debian.neo4j.com:443; Operation now in progress
error: https://debian.neo4j.com/neotechnology.gpg.key: import read failed(2).

Is there any person who faced this problem? Is there any solution to this issue?