Verify that the RRAS service is installed and configured correctly on the server. Has the server been configured to allow remote access? Verify there are enough ports available to connect, also verify network connectivity. Can the client and server see each other? i.e. Through a phone-line or the Internet. Is the client using the correct protocol and is it enabled in the remote access policy, e.g. Are both client and server configured to use PPTP?
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If using L2TP, do the client and server have valid certificates and is the client configured to use the correct protocol? Has the user been granted remote access through a remote access policy and has dial-in permission been enabled? Verify both client and server are using the same encryption methods and authentication protocols. If using multilink, ensure that multilink is enabled on both the client and the server, and enough ports have been allocated.