Internet Explorer ignores cookies on some domains (cannot read or set cookies)

problem ：

I have a site, eg example.com , where users can set their own subdomains (one user - one subdomain) and upload their own scripts, eg http://somedomain.example.com/xyzzy.php would map to /www/somedomain/xyzzy.php I have a website , for example example.com , Users can set their own sub domains （ A user - A subdomain ） And upload your own script , for example http://somedomain.example.com/xyzzy.php Map to /www/somedomain/xyzzy.php

Now, on some of those domains, Internet Explorer 7 won't/can't accept cookies. Now? , On some domains ,Internet Explorer 7 Will not / Can't accept cookie.Checked with Fiddler: the server sends Set-Cookie response correctly, yet the cookie never shows up in IE - for JS or Developer Tools. And Fiddler Check together ： The server sends correctly Set-Cookie Respond to , but cookie Never appeared in IE in - about JS or Developer Tools.On request, IE7 doesn't send the Cookie header either. According to the requirements ,IE7 It will not send Cookie header .

The cookies are set for the user's domain (eg somedomain.example.com ), path is / , tried different expiration options (past, future, current, "0"), are not HttpOnly, are not secure.Cookie It is set for the user's domain （ for example somedomain.example.com ）, The path is a / , Tried different expiration options （ In the past , future , At present ,“0”）, No HttpOnly, unsafe .

FF, Opera, Safari and Chrome all work without problems.FF,Opera,Safari and Chrome They all work .

Why does IE ignore the cookies? Why? IE Will ignore cookie？

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Solution ：

Reference resources ： https://stackoom.com/en/question/3KcN