Can no longer connect to shared drive for Time Machine backups

I have  a Firewire drive connected to my iMac and sharing enabled. 2 MacBook Airs then connect wirelessly to the same network and backup to the drive.
It has worked perfectly for the last couple of years with Lion and Mountain Lion.
Yesterday I upgraded to Mavericks and now neither laptop can see the shared drive in Time Machine, although the drive displays quite happily in Finder.
I have disabled and re-enabled sharing.  Booted and re-plugged the drive in and still when I go to Time Machine preferences and select drive, nothing is listed.
Any ideas?

After hours and hours of constant searching and testing I still can't get it to work?
Any ideas?
I think sharing has changed in Mavericks.

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