By default, our CentOS servers use wvdial
to create the dialup connection. Wvdial can sometimes be too clever for
its own good. If the server cannot dialup or communicate with the modem
for a specific time, it will shutdown the dialup interface all
together, thereby causing it to never dial again. To get things back in
action, you will just need to restart the network service.
There should be a shortcut to do this on the Desktop, or you can run the command manually from a command prompt.
service network restart
The dialup should be active again. You can check this by running ifconfig and making sure that you have an interface called ppp0
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