its not fail, your provider host free proxy servers... what a real fail is that, they are not separate proxy domain addresses from dynamic-static domains addresses... (or regulate any other protocol) they are all called same in domainame, ex: comcast.net
and should be:
proxy: .pr0xy-comcast.net
dynamic:.dyn-comcast.net
static: .static-comcast.net
all in all, ur provider have same anomaly... so if folks use n00b provider, they can check ur urself, before get banned: http://dnsbl.info