We have a long term SBS 2008 install that sometime fairly recently has started failing in RWW. I can login, check email, browse the sharepoint site just fine. However, when trying to connect to a computer it gets as far as asking about syncing printers and clipboard. Once I OK that the windows box comes up asking for credentials. all credentials i use just come back as login failed. i have verified that the terminal services gateway is running. I've restarted the server to see if that helped. I've created a new administrator level user to test, i've tried connecting to multiple different machines from multiple machines. It fails every time.
What is the source of it continuously rejecting any obviously valid credentials. Note, i have my syntax correct because it used to work just fine.