Application Insights and .Net Core - 0.0.0.0 IP

All my requests logged on application insights have the 0.0.0.0 IP. Why?

Details:
- Running a app on azure app service
- Using .Net Core 2
- Other info seems ok, like, some requests from around the globe and etc

Solution

The IP masking feature of Application Insights can be disabled.

Know your compliance requirements first before you do so!

There are two ways to do so:

First, make a REST call to reconfigure your existing App Insights instance

I suggest leveraging Azure CLI for that task, as you don't have to take care of the access token. Replace the missing values accordingly

<sub-id>
<rg-name>
<resource location>

az rest --method patch \
        --url https://management.azure.com/subscriptions/<sub-id>/resourceGroups/<rg-name>/providers/microsoft.insights/components/<resource-name>?api-version=2018-05-01-preview \
        --body { \"location\": \"<resource location>\", \"kind\": \"web\", \"properties\": { \"Application_Type\": \"web\", \"DisableIpMasking\": true } }

Second, use a custom TelemetryInitializer

public class CloneIpAddress : ITelemetryInitializer
{
    public void Initialize(ITelemetry telemetry)
    {
        if (telemetry is ISupportProperties propTelemetry && !propTelemetry.Properties.ContainsKey("client-ip"))
        {
            var clientIPValue = telemetry.Context.Location.Ip;
            propTelemetry.Properties.Add("client-ip", clientIPValue);
        }
    }
}

And than don't forget to register the type with the DI container

services.AddSingleton<ITelemetryInitializer, CloneIpAddress>();

The IP address will show up as a custom dimension