Hello Gurus,

  I am facing a problem related to REST service. We have Documentum installed for our instance. We have a Visualforce and a controller class which allows the user to store notes and attachment on the Documentum server. We were able to achieve this by making a REST call using Javascript.

  We have another external application which sends documents which are stored as attachments for contacts. We would like to store this attachments instead on Documentum. Since the other application doesn't allow us any customization,we are left with creating our own class (with future method) which will make a REST call.

The problem is we are able to successfully do it through Javascript but when we do it through Apex, we get the following exception:

FATAL_ERROR|System.CalloutException: Unable to tunnel through proxy. Proxy returns "HTTP/1.0 404 Not Found"

I don't believe it's a whitelisting issue. Any help would be greatly appreciated.

Thanks,
KB