I am running NT Server with 2 external modems. Sometimes when logging in using dial up networking, we get error 629 message and sometimes when someone's connected, it will just disconnects. I reinstalled SP5 but that didn't help ( saw an article on Microsoft site ). User name and password is correct. I don't know what else it could be and I can't find anymore info on the net. I just installed the second modem on COM1 and that's when it started happening.