If you're having trouble logging in to your modem, visit the Centurylink Business Email Login page. On the login page, you may see your modem's settings, view logs, and make adjustments. In addition to the login page, you can access your modem via the modem's web interface. Through the online interface, you may read logs, alter settings, and monitor your modem's settings. If there are no outages in your area, you can try to reset your modem or router. If it doesn't work, you may need to contact CenturyLink's customer service department for assistance.