I am happy to report this morning that my problem is solved, and I can connect to 3dcommune.  Their new servers must be in place, and somehow, that was my problem.  I am suspecting somehow my router had a case of the hickups (or maybe the mumps) because that is the only thing that our three computers have in common.  I do have an old b router.....

and I do want to thank everyone who tried to help me!