WCF Service returning “requested service '…' could not be activated” the first time it's accessed from an MVC site

Question

We have a WCF service (with no security) that is being accessed by an MVC3 website.

On the developer machines we have no problems with it but when our TeamCity setup bui

Answer 1

For me it turned out to be the Authentication setting in IIS was configured incorrectly. As such the authentication failure was blocking the initial request preventing the service from activating.