ASP.NET Core: How to get remote IP address?

Question

I try to get remote (client) IP addres:

var ip = httpContext.Features.Get<IHttpConnectionFeature>()?.RemoteIpAddress

But it works only for local requests (it will return ::1 value)

When I load page from remote machine the value is null. I investigated there is no IHttpConnectionFeature in the Features collection in this case.

Why? And how to get remote ip address correctly?

Solution 1

I know that this post is old but I came here looking for the same question and finnaly I did this:

On project.json add dependency:

"Microsoft.AspNetCore.HttpOverrides": "1.0.0"

On Startup.cs, in the Configure method add:

  app.UseForwardedHeaders(new ForwardedHeadersOptions
        {
            ForwardedHeaders = ForwardedHeaders.XForwardedFor |
            ForwardedHeaders.XForwardedProto
        });  

And, of course:

using Microsoft.AspNetCore.HttpOverrides;

Then, I got the ip like this:

Request.HttpContext.Connection.RemoteIpAddress

In my case, when debugging in VS I got always IpV6 localhost, but when deployed on an IIS I got always the remote IP.

Some useful links: How do I get client IP address in ASP.NET CORE? and RemoteIpAddress is always null

The ::1 may be because:

Connections termination at IIS, which then forwards to Kestrel, the v.next web server, so connections to the web server are indeed from localhost. (https://stackoverflow.com/a/35442401/5326387)

Solution 2

Just try this:

var ipAddress = HttpContext.Connection.RemoteIpAddress;

And if you have another computer in same LAN, try to connect with this pc but use user ip instead of localhost. Otherwise you will get always ::1 result.

Comments

[superjos]

when you find similar questions, and post similar answers, you might want to add a cross-reference between the two. Especially if one seems more complete than the other. HTH

[Johna]

@superjos what do you mean?

[superjos]

There's another SO question here which is very close to this one and where you basically copied the same answer. It might be useful in such cases to point one question to another. Maybe even flag question for closing.

[Johna]

Yes, the answer is the same because I answered both questions. I was looking for the same and when i found the solution, I answered both questions (i didn't mark as duplicated because both where asked a time ago and both already had different answeres that didn't solve the problem)

[chungonion]

Thanks man, I was wondering why it always show ::1 result, and your remark helped me to troubleshoot the problem. Cheeeers =]