[ubuntu] How to enable loopback connections on Ubuntu?

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http://ubuntuforums.org – Hello! Here's my situation: I run a webserver Apache2, php5, and MySQL. They are all set up correctly and I can access my website at http://localhost I have, also installed, noip2 to update my IP address to no-ip.com for my domain name. Here's the problem: I can access my website through that domain name on other computers, both on internet and on the same network. But I cannot access it from my own computer (using the domain name instead of localhost). I need to be able to access the domain name on my computer because some pages on my website have been defined as the address to my domain (HowTos)