Newsgroups not visible to potential subscribers

[Bernard Higonnet]

Hello,

I have just installed inn 2.5.5 under FreeBSD 10.1

innd and innwatch are running, I've created a newsgroup with ctlinnd 
which replied "OK" and the newgroups can be seen in db/active.

But when I try to subscribe using Thunderbird, I get the subscription 
dialog but no visible groups (nor do I see the "control" groups). 
Refreshing and looking at new groups does no good.

Can someone point me in the right direction?

TIA
Bernard Higonnet