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Error 629: You have been disconnected from the computer you dialed.
Double-click the connection to try again. 

There are several reason why you may be receiving the error 629. Below are a few examples:
The modem driver is corrupt
The DUN connection is dialing an invalid access number
The modem is not attempting a compatible connection
Authentication failure (invalid username or password)
Invalid or corrupt DUN connection settings

There are several reasons why a customer could receive this error message. Be sure to verify that they are using the correct username and password. Check to see what phone number they are dialing and make sure it isn't set to use area code and dialing properties. You should also verify TCP/IP settings. Have the customer take out the password and try to connect without it; if they aren't prompted for password delete TCP/IP and reinstall. It might also be necessary to remove and reinstall Dial-Up Networking.

Check the following:

Change the authentication to Clear Text under Security.
Lower the connection speed under Modem Configuration.
Disable hardware flow control under Modem Configuration.
Disable modem error control under Modem Configuration.
Disable modem compression under Modem Configuration.
Disable PPP LCP extensions.
Disable IP header compression.
Check DNS configuration.
Check the user name and password syntax.
Connect using a Terminal window.
Contact the modem's manufacturer for updated drivers.
Have the phone company check the phone lines.

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