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Cannot Connect

Why do I keep getting the Error message Unable to contact NetZero server?
I get Failed connecting to our server when I try to connect.
Connection Failure - The member ID or password you have entered is incorrect.
Error 691 - Invalid Username/Password with NetZero HiSpeed.
No network connection established.
I click on the Connect button but nothing happens.
Error "Problem starting NetZero".
Why can't I connect to my access number?
My Firewall program keep blocking NetZero.
Error 650: Server not Responding.
Error 678: Remote modem not responding.
Error 680: There is no dial tone.
Error 676: The line is busy.
I get an error message "Modem does not exist, is not plugged in, or is out of service".
I get an error message 'Computer is not receiving a response from the modem' though my modem is connected.
I receive Your copy of the NetZero HiSpeed software has been corrupted while connecting with NetZero HiSpeed.
NetZero HiSpeed could not start due to a conflict with another application.
NetZero HiSpeed has encountered a problem while launching.
NetZero HiSpeed encountered a problem while starting, disabling acceleration for this online session.
Error 731: Protocol Not Configured.

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