Not able to create connections to http://dmoz.org/http://www.dmoz.org/Health/Conditions_and_Diseases/Musculoskeletal_Disorders/Back_and_Spine/Scoliosis/Support_Groups/ from your server.
The reason might be a firewall, proxy, or http://dmoz.org/http://www.dmoz.org/Health/Conditions_and_Diseases/Musculoskeletal_Disorders/Back_and_Spine/Scoliosis/Support_Groups/ or your web hosting company might be blocking outside connections.
Another possibility is a timeout because of slowdown in internet itself.