> Setting oxd configs (host: gluu2, port: 443, post logout: https://gluu2/casa/bye.zul)
Probably during setup you did not choose oxd to be installed but entered the location of oxd server manually. When that's the case oxd is supposed to be running elsewhere in a different host but here it is pointing to the same machine where you installed Gluu and using the port 443 which is the port that Apache uses already.
If this is your first time installing Gluu, I'd recommend starting all over again and selecting oxd-server at installation so that components get configured automatically for you.