I have a vertical market app "PestaRoo" where each copy in the wild calls home to my registration server to verify their paid status. It has worked flawlessly for many years running on an old Mac Mini with Server 12. As the Mini is dying, I have moved that registration file to my Mac Pro which is running Server 15. In the eight days since the move all pinging has failed. In a typical day I receive 75 to 100 pings from customers. Now no 'ping' attempts get through. In de-bugging, we find that an error code of 1631 is always returned. Yes, xml is enabled in the file. Yes, the read writes are correct. Yes, Web Publishing is on. Yes, I have enabled XML publishing. And I have started and restarted the machine and the Web Publishing and XML publishing multiple times. I am baffled! What have I missed? Does Server 15 have a different syntax?