D-Link DSL-2520U User Manual page 40

Appendix A – Troubleshooting
4. Why can't I get an Internet connection?
For ADSL subscribers, please contact your ISP to make sure the ADSL service has been enabled by your ISP, and your ISP username and
password are correct.
5. What can I do if my router can't be detected by running installation CD?
• Ensure the Router is powered on.
• Check that all the cables are firmly connected at both ends and all LEDs work correctly.
• Ensure only one network interface card on your PC is activated.
• Click on Start > Control Panel > Security Center to disable the setting of Firewall.
Note:
There might be a potential security issue if you disable the setting of Firewall on your PC. Please remember to turn it back on once you have finished
the whole installation procedure and can surf on Internet without any problem.
D-Link DSL-2520U User Manual 40