Here is an weird one....
Just did an TeamMentor auto-deploy (via a GitHub push that triggered AppHarbor via a webhook) and the published site is running OK (on the deployed AppHarbor server) ....
.... but the 'REST help page' (on the same server) throws this error:
Interestingly, the actual REST calls seem to be OK (meaning that at least, the error doesn't disable the REST service):
I wonder when this happens, and if this situation (which is a kind of mild DoS) could be triggered on a 'normally working server' via remote (to the server) requests.
Meanwhile, all looks good with the same code based deployed to Azure: