I am running Fedora Core 6, for its ease and stability.
Yes, I can log into admin now, and everything seems to be configured OK. There is nothing I can see that would cause me concern.
Last night, sitting here tweaking the thing it occured to me to open ports 5222 and 5223 through the firewall, which was successful.
I then tried to log in on several different computers connecting through entirely different modems and user accounts, but still no success.
This morning when I woke up I kept wondering whether the jabber server name has to be delegated somehow, like an ordinary domain name.
Will keep trying today.