The ARR is working great in all browsers except Internet Explorer 8,9,10. When I paste Hebrew URL directly to the address bar it's working good, but when I surf (click on a simple href URL) from one Hebrew URL page to another Hebrew URL the ARR return me that error: "502 - Web server received an invalid response while acting as a gateway or proxy server." There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server. I checked it number of times including with HTTP analyzer and I saw that the "referer" is making all the problems and cause to that error. For example when I enter to that page: mydomain.com/somehebrewchars (mydomain.com/???? you will need Hebrew install) And click in the page on a link to: mydomain.com/somehebrewchars2 (mydomain.com/???????? you will need Hebrew install) I will get the error above and when you look at the referrer you will see something like that: mydomain.com/עמוד-× ×—×™×ª×” We use other proxies application to others projects and we don't have the same issue like that. For this example we used WIN 2008 and 2012 with ARR 2.5 and also 3 beta. Any help is welcome :-) Thanks, Noam