Hey. mod/core.html#servername says: "Additionally, this is used when creating self-referential redirection URLs when UseCanonicalName is set to a non-default value." However, this seems to be wrong. The default value of UseCanonicalName is "Off", but the non-default value might not be just "On", in which case the above sentence would be true, but also "DNS", in which case "Apache httpd does a reverse DNS lookup on the server IP address that the client connected to in order to work out self-referential URLs". So the sentence should be rather something straight forward like: "Additionally, this is used when creating self-referential redirection URLs when UseCanonicalName is set Off." Cheers, Chris.