Remote Web Access (RWA) is a web based portal on Small Business Server 2011 Essentials, Home Server 2011, and Windows Storage Server 2008 R2 Essentials that allows for remote access to files on the server, to workstations that support remote desktop, and other resources remotely. For an overview, you can view this video.
Background
RWA depends on two set of configurations to work properly:
There are 2 wizards that help automating the above configuration efforts. If you choose to manually configure these settings, you should strictly follow the guidance to avoid complications. Prepare the Router
Prepare the RWA domain and cert
For SBS 2011 Essentials/Windows Storage Server 2008 R2:
The RWA configuration wizard only supports the purchasing of the domain name and SSL cert from Godaddy/Enom. If you have never before purchased a domain, using this process will be the easiest route and you should be able to finish the purchasing and configuration using the wizard. If you want use a certificate or domain outside these two scenarios, manual steps are required:
For Windows Home Server 2011
Common Known issues
Domain configuration wizard Errors:
Symptom: Error message shown up in the wizard, the error message is "Domain Name Setup Failed. An unexpected error has occurred communicating with the Windows Live Domains service. 80000190"
Solution: Correct the server time, and ensure both the server and client's time are in sync, and rerun the wizard. Solution: At times this can be caused by temporary Internet conditions and unavailability of LiveID., wait a few moments and try again. 2. Setting up a domain from Enom, a user who doesn’t buy the domain from Domain configuration wizard will fail at end of the wizard. Solution: Enom recently fixed this problem, and you should no longer see this issue, please rerun to fix the problem. 3. Enom/Godaddy user who attempts to use another vendors SSL cert which is not bought as part of the domain configuration wizard, will see a failure at end of the wizard. Solution: refer wiki http://social.technet.microsoft.com/wiki/contents/articles/manually-install-existing-ssl-certificate-into-small-business-server-2011-essentials.aspx
Problem when accessing RWA and attempting to connect to a workstation via RDP:
Symptom: Error 1: An error occurred while sending data to the Remote Desktop Gateway server. The server is temporarily unavailable or a network connection is down. Try again later, or contact your network administrator for assistance. Error 2: Your computer can't connect to the remote computer because an error occurred on the remote computer that you want to connect to. Contact your network administrator for assistance. If you ignore the error message and click Connect again, you will be able to connect to the remote server.
Solution: turn on CredSSP (refer http://support.microsoft.com/default.aspx?scid=kb;en-us;951608 (see also the release notes for SBS 2011 Standard for similar issue) 2. User can use remote desktop from home network but can’t access it from Remote Web Access. Symptom: Remote Access Error '-212147024893' error when click on any PC or Server in the Remote Web Access portal.
Solution: A. Make sure the router is configured correctly ( http://social.technet.microsoft.com/wiki/contents/articles/windows-small-business-server-2011-essentials-router-setup.aspx#NetgearRP614 )