Recreated certificate - re-started ISPConfig. Same thing.
I don't think it is an ISPConfig issue. (In fact is NOT an ISPConfig issue) I connected to the admin panel from another computer in my LAN and it works fine. It also works fine from a windows XP virtual terminal on my machine. Also works fine from IE4linux on my machine.
Must be something in Firefox on my machine - I cleared cache, cookies & SSL certs - same thing.
Not a big deal since I can access from everywhere else - Just a challenge for me to make it work.
Thanks for your help.