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Error 647

1.  This can happen when the user dials into an NT server.  If you are using an NT server, then perhaps you should allow them to login.  If not, make sure they are dialing the correct phone number.

2.  Verify Username and Password. Make sure you are using the correct auth scheme (most often clear text if dialing into a reg ISP).

3.  Make certain that you are dialing the correct ISDN number and that it does not contain illegal characters. Is it a local call? If not, verify that the user is certain that they have clear channel Long Distance service.

4.  Verify that the user's account is setup for ISDN. (ISP/auth end)

5.  Verify that the user's account has not been deactivated. (ISP/auth end)

6.  Verify the POP isn't down and that it is accepting ISDN connections

3.  Try resetting their password.