No updates received on iOS based devices connected to CalHost server.

You configured new WebDav based Calendar account on your iPhone / iPad device and synced it successfully. However new items created at GW site are not pushed to those devices. All works fine for Mac workstations where updates get PUSHed successfully.

The CalHost server solution was meant for real Mac workstations only. A design goal did not include iOS based mobile devices which have completely different WebDav client implementation and a registration process. This is not a bug but rather Enhancement request which has been submitted to our engineering.