intranet -- got it
I figured it out. (I also realized I had posted in the wrong forum as my question concerned setting up the intranet website using ISPConfig.)
Falko, your how-to was outstanding! I have a very little knowledge of Linux, mostly from what my son has taught me. I set up my server -exactly- as you said, only losing my nerve when TLS started asking for authentication for certificates. I made notes of everything I entered and just kept plugging along. I couldn't get Putty to work to copy and paste your text, so I typed it all in manually, checking everything line by line. It worked perfectly. Thank you so much!