Product:
Cognos Controller Web 10.4.2
Microsoft Windows 2019 server
Problem:
User browse to Controller web and get a message
Server is not reachable or still initializing, please refresh the page in a few seconds
Possible Solution:
Depending on the URL you enter in your Internet Explorer you will succeed or not.
This give above error
http://servername:9080/#!/Login
If you enter the FQDN like this it will work
http://servername.domain.com:9080/#!/Login
The error can also be that you are to fast, the controller web will need some time to start up.
More information: