Presuming this is a dial-up one:
In Network connections, r-click on the connection and take Properties.
In the Options page check 'Prompt for username and password' and 'prompt
for phone number'
Now try to connect, insert the appropriate values and check the box to
'always use this ' and it should get remembered for the future (and you
can take the Options there and uncheck)
Alex Nichol MS MVP (Windows Technologies)
Bournemouth, U.K. XXXX@XXXXX.COM