diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9ade708b91..00660228c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 
 ## v1.34.3
 
+### Bugfixes
+
+- [Core] Oops, `HttpClient` actually sucks (#3960 by: HebaruSan)
+
 ### Internal
 
 - [Netkan] Re-sort module properties after merging (#3957 by: HebaruSan)
diff --git a/Cmdline/CKAN-cmdline.csproj b/Cmdline/CKAN-cmdline.csproj
index 43245ee6e5..12819a8ecd 100644
--- a/Cmdline/CKAN-cmdline.csproj
+++ b/Cmdline/CKAN-cmdline.csproj
@@ -24,7 +24,7 @@
     <FileAlignment>512</FileAlignment>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <NoWarn>IDE1006</NoWarn>
+    <NoWarn>IDE1006,NU1701</NoWarn>
     <CoreCompileDependsOn>PrepareResources;$(CompileDependsOn)</CoreCompileDependsOn>
   </PropertyGroup>
   <ItemGroup>
diff --git a/Core/Games/KerbalSpaceProgram.cs b/Core/Games/KerbalSpaceProgram.cs
index 969e11ae1c..b767fd556a 100644
--- a/Core/Games/KerbalSpaceProgram.cs
+++ b/Core/Games/KerbalSpaceProgram.cs
@@ -266,34 +266,34 @@ public GameVersion DetectVersion(DirectoryInfo where)
 
         public Uri MetadataBugtrackerURL => new Uri("https://github.com/KSP-CKAN/NetKAN/issues/new/choose");
 
-        private string Missions(GameInstance inst)
+        private static string Missions(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(inst.GameDir(), "Missions"));
 
-        private string Ships(GameInstance inst)
+        private static string Ships(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(inst.GameDir(), "Ships"));
 
-        private string ShipsVab(GameInstance inst)
+        private static string ShipsVab(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(Ships(inst), "VAB"));
 
-        private string ShipsSph(GameInstance inst)
+        private static string ShipsSph(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(Ships(inst), "SPH"));
 
-        private string ShipsThumbs(GameInstance inst)
+        private static string ShipsThumbs(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(Ships(inst), "@thumbs"));
 
-        private string ShipsThumbsSPH(GameInstance inst)
+        private static string ShipsThumbsSPH(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(ShipsThumbs(inst), "SPH"));
 
-        private string ShipsThumbsVAB(GameInstance inst)
+        private static string ShipsThumbsVAB(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(ShipsThumbs(inst), "VAB"));
 
-        private string ShipsScript(GameInstance inst)
+        private static string ShipsScript(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(Ships(inst), "Script"));
 
-        private string Tutorial(GameInstance inst)
+        private static string Tutorial(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(inst.GameDir(), "saves", "training"));
 
-        private string Scenarios(GameInstance inst)
+        private static string Scenarios(GameInstance inst)
             => CKANPathUtils.NormalizePath(Path.Combine(inst.GameDir(), "saves", "scenarios"));
 
         private readonly Dictionary<string, string> allowedFolders = new Dictionary<string, string>
@@ -343,7 +343,7 @@ private static string KSPDirectory(string steamPath)
         /// <returns>
         /// args or args minus parameter
         /// </returns>
-        private string[] filterCmdLineArgs(string[] args, GameVersion installedVersion, GameVersionRange crashyKspRange, string parameter)
+        private static string[] filterCmdLineArgs(string[] args, GameVersion installedVersion, GameVersionRange crashyKspRange, string parameter)
         {
             var installedRange = installedVersion.ToVersionRange();
             if (crashyKspRange.IntersectWith(installedRange) != null
diff --git a/Core/Net/Net.cs b/Core/Net/Net.cs
index 8167c45208..4c0608f487 100644
--- a/Core/Net/Net.cs
+++ b/Core/Net/Net.cs
@@ -3,7 +3,6 @@
 using System.IO;
 using System.Linq;
 using System.Net;
-using System.Net.Http;
 using System.Text.RegularExpressions;
 using System.Threading;
 
@@ -46,27 +45,17 @@ public static class Net
         /// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
         /// </returns>
         public static string CurrentETag(Uri url)
-            => httpClient.SendAsync(new HttpRequestMessage(HttpMethod.Head, url),
-                                    HttpCompletionOption.ResponseHeadersRead)
-                         .Result
-                         .Headers.ETag.ToString()
-                         .Replace("\"", "");
-
-        /// <summary>
-        /// "HttpClient is intended to be instantiated once and reused
-        ///  throughout the life of an application. In .NET Core and .NET 5+,
-        ///  HttpClient pools connections inside the handler instance and
-        ///  reuses a connection across multiple requests. If you instantiate
-        ///  an HttpClient class for every request, the number of sockets
-        ///  available under heavy loads will be exhausted. This exhaustion
-        ///  will result in SocketException errors."
-        /// </summary>
-        public static readonly HttpClient httpClient = new HttpClient();
-        public static readonly HttpClient nonRedirectingHttpClient = new HttpClient(
-            new HttpClientHandler()
-            {
-                AllowAutoRedirect = false,
-            });
+        {
+            // HttpClient apparently is worse than what it was supposed to replace
+            #pragma warning disable SYSLIB0014
+            WebRequest req = WebRequest.Create(url);
+            #pragma warning restore SYSLIB0014
+            req.Method = "HEAD";
+            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
+            string val = resp.Headers["ETag"]?.Replace("\"", "");
+            resp.Close();
+            return val;
+        }
 
         /// <summary>
         /// Downloads the specified url, and stores it in the filename given.
@@ -257,10 +246,6 @@ public static Uri ResolveRedirect(Uri url)
             const int maxRedirects = 6;
             for (int redirects = 0; redirects <= maxRedirects; ++redirects)
             {
-                #if NETFRAMEWORK
-
-                // HttpClient doesn't handle redirects well on Mono, but net7.0 considers WebClient obsolete
-
                 var rwClient = new RedirectWebClient();
                 using (rwClient.OpenRead(url)) { }
                 var location = rwClient.ResponseHeaders["Location"];
@@ -281,37 +266,6 @@ public static Uri ResolveRedirect(Uri url)
                 {
                     throw new Kraken(string.Format(Properties.Resources.NetInvalidLocation, location));
                 }
-
-                #else
-
-                var req = new HttpRequestMessage(HttpMethod.Head, url);
-                req.Headers.UserAgent.Clear();
-                req.Headers.UserAgent.ParseAdd(UserAgentString);
-                using (var response = nonRedirectingHttpClient.SendAsync(
-                                          req, HttpCompletionOption.ResponseHeadersRead).Result)
-                {
-                    if (response.Headers.Location == null)
-                    {
-                        return url;
-                    }
-
-                    var location = response.Headers.Location.ToString();
-                    if (Uri.IsWellFormedUriString(location, UriKind.Absolute))
-                    {
-                        url = response.Headers.Location;
-                    }
-                    else if (Uri.IsWellFormedUriString(location, UriKind.Relative))
-                    {
-                        url = new Uri(url, response.Headers.Location);
-                        log.DebugFormat("Relative URL {0} is absolute URL {1}", location, url);
-                    }
-                    else
-                    {
-                        throw new Kraken(string.Format(Properties.Resources.NetInvalidLocation, location));
-                    }
-                }
-
-                #endif
             }
             return null;
         }
diff --git a/Core/Net/RedirectWebClient.cs b/Core/Net/RedirectWebClient.cs
index 661252fc10..3c279ce8e9 100644
--- a/Core/Net/RedirectWebClient.cs
+++ b/Core/Net/RedirectWebClient.cs
@@ -1,8 +1,8 @@
-#if NETFRAMEWORK
-
 using System;
 using System.Net;
 
+#pragma warning disable SYSLIB0014
+
 namespace CKAN
 {
     // HttpClient doesn't handle redirects well on Mono, but net7.0 considers WebClient obsolete
@@ -23,5 +23,3 @@ protected override WebRequest GetWebRequest(Uri address)
         }
     }
 }
-
-#endif
diff --git a/GUI/Main/MainRepo.cs b/GUI/Main/MainRepo.cs
index 0b7f26a849..1bc1cf473f 100644
--- a/GUI/Main/MainRepo.cs
+++ b/GUI/Main/MainRepo.cs
@@ -202,7 +202,22 @@ private void PostUpdateRepo(object sender, RunWorkerCompletedEventArgs e)
                         EnableMainWindow();
                         break;
 
+                    case AggregateException exc:
+                        foreach (var inner in exc.InnerExceptions
+                                                 .SelectMany(inner =>
+                                                     inner.TraverseNodes(ex => ex.InnerException)
+                                                          .Reverse()))
+                        {
+                            log.Error(inner.Message, inner);
+                            currentUser.RaiseMessage(inner.Message);
+                        }
+                        AddStatusMessage(Properties.Resources.MainRepoFailed);
+                        Wait.Finish();
+                        EnableMainWindow();
+                        break;
+
                     case Exception exc:
+                        log.Error(exc.Message, exc);
                         currentUser.RaiseMessage(exc.Message);
                         AddStatusMessage(Properties.Resources.MainRepoFailed);
                         Wait.Finish();
diff --git a/Netkan/CKAN-netkan.csproj b/Netkan/CKAN-netkan.csproj
index ea5bc06ffd..dcc9be7eca 100644
--- a/Netkan/CKAN-netkan.csproj
+++ b/Netkan/CKAN-netkan.csproj
@@ -23,7 +23,7 @@
     <FileAlignment>512</FileAlignment>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <NoWarn>IDE1006</NoWarn>
+    <NoWarn>IDE1006,NU1701</NoWarn>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Autofac" Version="4.9.4" />
diff --git a/Tests/Tests.csproj b/Tests/Tests.csproj
index ee48db95c3..0cedf0cc1c 100644
--- a/Tests/Tests.csproj
+++ b/Tests/Tests.csproj
@@ -18,7 +18,7 @@
     <Configurations>Debug;Release;NoGUI</Configurations>
     <Prefer32Bit>false</Prefer32Bit>
     <LangVersion>7.3</LangVersion>
-    <NoWarn>IDE1006</NoWarn>
+    <NoWarn>IDE1006,NU1701</NoWarn>
     <TargetFrameworks>net48;net7.0;net7.0-windows</TargetFrameworks>
     <BaseTargetFramework>$(TargetFramework.Replace("-windows", ""))</BaseTargetFramework>
     <DefaultItemExcludes Condition=" '$(TargetFramework)' == 'net7.0' ">$(DefaultItemExcludes);AutoUpdate\**;GUI\**</DefaultItemExcludes>