619: The especified port is not connected

Hi,

Thanks for reading this. I have a problem with my dial up
connection. Neither of them work after installing SP4. I
can connect and after 1 minute (more or less) checking the
user name and password I receive the following error
message:

619: The especified port is not connected

I've done a lot of things even change the modem, applying
the hotfix of article Q824301 , Uninstall and install
again TCP/IP protocol, read other microsoft article
related, check from top to bottom the PPP and RAS log, etc
but nothing solve the problem. I've found also a lot
threads on the microsoft.public. newsgroups regarding this
problem but none of them with the solution. I'm totally
desperated and I don't want to reinstall Win2000 again. I
would like to know what is causing this. Maybe is
something wrong in the last SP4, if so, Why Microsoft
don't do a patch ??

Anyway, do you have any clue or advice. I'll be very
grateful.

Thanks in advance for any reply.

Fernando.