In a new installation of Zulu, everything works fine inside the office, but remote users get an error message indicating that iCal sees no CalDAV server at my I.P. address. The list of Apple's commonly used ports says iCal uses port 80, so I don't see why there would be a problem. Is there another port that needs to be forwarded?

Hi,

Sorry for the late response. We had some trouble with our mail notifications that new posts had come in and it's been corrected!

Correct, the iCal traffic goes over 80, so if that's forwarding to your FileMaker server you should be able to hit it from outside the firewall. The URL you use outside does need to reference the public IP, but that should work.

Please let me know if this is still an issue.

Thanks,
Jason