Just a short hint.
Yesterday when I worked with Excel Services I have got following error:
„This file cannot be saved to this location because there is no connection to the server. Check your network connection and try again.“
I got this error because I wanted to publish a new created Excel file in my document library. When I uploaded the file everything was successfully working.
When I searched for this problem I found out that many people have the same problem including synchronizing errors with outlook.
To resolve your problem stop the System Event Notification service.
net stop sens
If you make an IISReset think about that you need to stop the System Event Notification again.
Last but not least I should say that the error occured when I worked on the server. On the client side I never had this problem before.