well let me just give ya the link that I used for server setup https://gamefaqs.gamespot.com/dreamcast ... faqs/10444
You may be saving your config file as a txt file in the base q3 folder that's why it don't work.
When creating the cfg file in the base q3 with the note pad u need to click " file" on the upper left corner of the notepad then click "save as" then u type ffa.cfg in the file name and hit save. That will save it as a cfg file . When done u should see ffa as the name and if you right click it and hit properties the file type should say cfg
Make sure u set the master server to dc.dreamcast-talk.com so it shows on the master list and open port 27960.