Many of you folks have requested that EPM Live support the use of a Proxy Server when using Project Publisher. We have developed this functionality into our product but will wait until our next major release to release this to the general community; however, if you have a need for this right now, contact EPM Live support and we will provide you with a hotfix for this issue.
Here is how you configure your Project Publisher to use a Proxy:
1. From your Project Publisher menu, select Proxy Settings from the Help menu.

2. Select “Use Proxy Server” and enter your Proxy Server settings. If your Proxy Server required authentication, be sure to enter the Username and Password under the “Authentication” section.

Now you should be able to publish and receive updates from SharePoint!