Why do you post this in a Public Forum
Just create a Support Ticket with all your information in it and thats all.
They are always fast with responding on your Ticket.
Possibly because this issue can be caused for a small number of reasons, possibly, but not limited to, a DNS issue. We have had exactly the same issue on one of our boxes, and if there was a post in the forums relating to checking DNS config, I would have not had to have contacted the Iworx boys. The forums are here for discussion amongst Iworx uses, and the conversations produced are more often than not, absolutely invaluable.