As common sense would dictate, there is plenty of information available right on the DirectAccess server that can help you diagnose and resolve problems you may encounter. Most of this information is available from inside the Remote Access Management Console page, which you can open from the Tools menu inside Server Manager. Once open, there are plenty of different tiers worth of data to examine. The dashboard gives you a quick overhead view of everything happening currently on the server. If you need to dig a little further, the Operations Status page is the most helpful for diagnosing server-side problems. This page employs nice "green check" versus "red x" status indicators for each separate technology that is being used by DirectAccess. When everything is running well, you should see something similar the following screenshot:
If anything is amiss with any one of these technologies, instead of the green checkmark you will see a red "x", and clicking it...