As you may recall from setting up URA earlier, there are some specific options related to the Network Connectivity Assistant. This was part of the remote client (step 1) setup, where the final page is the Network Connectivity Assistant page. That page has four configuration options you should consider.
The first one is the validation probes. These are servers within the corporate network which the NCA attempts to contact once it establishes the URA connection. If the NCA is able to connect to these resources, it determines that the connection is successful. The reason for needing the validation probes is because in some situations, a URA connection may actually work only partially. If you recall , the URA connection in the advanced mode uses two tunnels, where the first one allows a connection only to the domain controllers and allows the client to perform NTLM authentication against the DCs, and that's what allows the second tunnel to connect. Sometimes...