I do not use scrapebox for bulk commenting or any other task except, page rank checking, finding inner links using google footprint. I have been noticing since long that I cannot check bulk page rank using free proxies. After checking few pages, it shows Error 404 Socket Error or dead proxy. I even tried to check page rank without proxies and after checking few pages, it shows Error 404 Connection. What does those mean? Is that the problem of my ISP or any other settings ? Very confused and Disappointed for such problem. Please hlep me to solve the problem. Thanks in Advance.