from ownCube: "Our techs have looked into this already and there is no server side issue at all.
Also someone posted that they have issues with hosting provider Arvixe, so would be a wonder that ALL hosting providers have wrong server config right
The problem is that app that it takes the server hostname sft instead of the domain name that is configured in the SRV record or something, not sure how it is developed.
To verify our techs have tried other sync apps like caldavsync and carddavsync from the APP store and there is no issue at all, it uses right domain and connection and works instant, also with your provided testaccount so it could not be a server side issue at all or how can you/they explain that ALL other tested apps works ?!, its specified to this app that you can verify with EVERY other sync app in the app store and you will see it works fine, just this ONE app does not due reasons we dont understand.
Our techs will have a look anyway but because 4 different other cal/carddav apps are working fine we thinkg we dont investigate much time in this.
i will update you if i have more infos."