diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2df7cc9752..6290e382e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 - Save the update channel in **Settings > Updates** when you select **Preview** or **Nightly**. Before, the "Save changes" bar did not open for these channels, so the change was lost when you refreshed the page
 - Save the healthcheck **Check type** when it is the only change. Before, the "Save changes" bar did not open when you changed only the check type, for example from **Container command** back to **HTTP request**
 - Coolify Cloud: end a paid subscription that lost its link to Stripe when the customer cancels it. Before, it stayed active, and `cloud:sync-stripe-subscriptions` did not report it
+- Keep the dashboard proxy configuration of a server with the IP `host.docker.internal` that is not the default localhost server. Before, Coolify did not see this server as localhost after it saved the server, for example after a proxy restart, and deleted `coolify.yaml`, so the dashboard was not reachable at its domain ([#12444](https://github.com/coollabsio/coolify/issues/12444))
 
 ## [v4.6.0] - 2026-11-02
 
diff --git a/app/Models/Server.php b/app/Models/Server.php
index c2e36b1fd6..9ce8903655 100644
--- a/app/Models/Server.php
+++ b/app/Models/Server.php
@@ -179,10 +179,10 @@ class Server extends BaseModel
         static::saving(function ($server) {
             $payload = [];
             if ($server->user) {
-                $payload['user'] = str($server->user)->trim();
+                $payload['user'] = trim($server->user);
             }
             if ($server->ip) {
-                $payload['ip'] = str($server->ip)->trim();
+                $payload['ip'] = trim($server->ip);
 
                 // Update ip_previous when ip is being changed
                 if ($server->isDirty('ip') && $server->getOriginal('ip')) {
diff --git a/tests/Feature/Server/ServerSavingKeepsStringAttributesTest.php b/tests/Feature/Server/ServerSavingKeepsStringAttributesTest.php
new file mode 100644
index 0000000000..ccea358156
--- /dev/null
+++ b/tests/Feature/Server/ServerSavingKeepsStringAttributesTest.php
@@ -0,0 +1,44 @@
+<?php
+
+use App\Models\InstanceSettings;
+use App\Models\PrivateKey;
+use App\Models\Server;
+use App\Models\Team;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Process;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    Server::flushIdentityMap();
+    Process::fake();
+    InstanceSettings::forceCreate(['id' => 0]);
+    $team = Team::factory()->create();
+    $privateKey = PrivateKey::factory()->create(['team_id' => $team->id]);
+    $this->server = Server::factory()->create([
+        'team_id' => $team->id,
+        'private_key_id' => $privateKey->id,
+        'ip' => ' host.docker.internal ',
+        'user' => ' root ',
+    ]);
+});
+
+it('keeps ip and user as trimmed strings on the same instance after save', function () {
+    expect($this->server->id)->not->toBe(0)
+        ->and($this->server->ip)->toBe('host.docker.internal')
+        ->and($this->server->user)->toBe('root')
+        ->and($this->server->isLocalhost())->toBeTrue();
+
+    $this->server->save();
+
+    expect($this->server->ip)->toBe('host.docker.internal')
+        ->and($this->server->user)->toBe('root')
+        ->and($this->server->isLocalhost())->toBeTrue();
+});
+
+it('returns the normalized ip after save, not the raw input', function () {
+    $this->server->update(['ip' => ' 2A01:04F8::0001 ']);
+
+    expect($this->server->ip)->toBe('2a01:4f8::1')
+        ->and($this->server->fresh()->ip)->toBe('2a01:4f8::1');
+});