"First of all, I'd sorry for my writing cause i'm not from a country that using english language." Hi, i'm stucking with a problem for days. I'm buiding a resell website that using steam account to login (may i call steam passport?) . And the problem is that new user sometime can login into website via steam but sometime cant. My website using asp.net with Openid provider When i debug , the data-information steam null but when everything pass threw i receive the data like usual. http is using now as my website.