diff --git a/src/NzbDrone.Host/Startup.cs b/src/NzbDrone.Host/Startup.cs
index ecf50e427..315007a34 100644
--- a/src/NzbDrone.Host/Startup.cs
+++ b/src/NzbDrone.Host/Startup.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Net;
 using DryIoc;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Builder;
@@ -59,8 +60,9 @@ public void ConfigureServices(IServiceCollection services)
             services.Configure<ForwardedHeadersOptions>(options =>
             {
                 options.ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto | ForwardedHeaders.XForwardedHost;
-                options.KnownNetworks.Clear();
-                options.KnownProxies.Clear();
+                options.KnownNetworks.Add(new IPNetwork(IPAddress.Parse("10.0.0.0"), 8));
+                options.KnownNetworks.Add(new IPNetwork(IPAddress.Parse("172.16.0.0"), 12));
+                options.KnownNetworks.Add(new IPNetwork(IPAddress.Parse("192.168.0.0"), 16));
             });
 
             services.AddRouting(options => options.LowercaseUrls = true);