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I have a static ip address granted by my ISP. I have a small home server (Ubuntu server+ Apache) and I maintain a website which used to be reachable by domain name and by ip address. Suddenly I realized I can't reach my website- instead of a page there is a pop up window asking for my DSL router username and password. What could be the possible reason?

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migrated from Apr 7 '11 at 10:19

This question came from our site for system and network administrators.

Are you attempting to access it from inside or outside your own LAN? (It does not matter if you're using a public address. What matters is where you are connecting from.) – grawity Apr 7 '11 at 14:39
If you haven't fixed this yet, I'd fix immediately. I'd turn off WAN configuration in your router, this is a major security hole. – Rich Homolka Jun 13 '11 at 22:51

You need to forward the port(s) to your webserver (80) to the correct IP within your LAN.

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The ports are forwarded (actually the whole system worked for many months, I did not change anything, it just stopped working). – Michael Apr 7 '11 at 10:19
You need to make sure that management of your router from outside is turned off. A recent firmware update may have changed the setting? – Majenko Apr 7 '11 at 10:49

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