问题
Sometimes my ASP.NET application returns a value of "::1" when querying Page.Request.UserHostAddress.
I can't see any pattern as to when it returns a correct IP address vs when it returns the incorrectly formatted string. It will work for half a day and then stop working for an hour randomly. Any thoughts?
Edit:
Okay, it's the loopback address for IPv6. :) Which leads to the further question... When/why would IPv6 be used on some occasions and not others?
回答1:
::1 is the IPv6 loopback address. Equivalent to 127.0.0.1 for IPv4.
回答2:
That's also a correct IP address, but it's an IPv6 address instead of an IPv4 address.
回答3:
I believe you can override this by commenting out the IPv6 localhost entry your hosts file. The file is at:
C:\Windows\System32\drivers\etc\hosts
You'll want to modify the last couple of lines to look like this:
127.0.0.1 localhost
# ::1 localhost
回答4:
I believe the Visual Studio Web Server defaults to IPv6, could can turn off the support in the browsers, here is a post about a bug that causes performance issues with Firefox and IPv6.
回答5:
I guess you are on the server, browse your website and page from a remote machine you should see the client IPv4 address.
来源：https://stackoverflow.com/questions/960019/page-request-userhostaddress-is-in-an-invalid-format