diff --git a/dns/bind/pkg-descr b/dns/bind/pkg-descr
index f9466b370..b995ce64f 100644
--- a/dns/bind/pkg-descr
+++ b/dns/bind/pkg-descr
@@ -16,6 +16,7 @@ Plugin Changelog
 * Rename Master/Slave to Primary/Secondary (contributed by Robbert Rijkse)
 * Add necessary hooks to allow the plugin to be used as a standalone core DNS server
 * Changed default listening addresses to 0.0.0.0/:: for new users and interally translate these to "any"
+* Prevent using a port being used by another DNS service
 
 1.25
 
diff --git a/dns/bind/src/opnsense/mvc/app/models/OPNsense/Bind/General.php b/dns/bind/src/opnsense/mvc/app/models/OPNsense/Bind/General.php
index 4d6a5bd0c..b2cff5a82 100644
--- a/dns/bind/src/opnsense/mvc/app/models/OPNsense/Bind/General.php
+++ b/dns/bind/src/opnsense/mvc/app/models/OPNsense/Bind/General.php
@@ -1,35 +1,62 @@
 <?php
 
 /*
-    Copyright (C) 2018 Michael Muenz <m.muenz@gmail.com>
-    All rights reserved.
-
-    Redistribution and use in source and binary forms, with or without
-    modification, are permitted provided that the following conditions are met:
-
-    1. Redistributions of source code must retain the above copyright notice,
-       this list of conditions and the following disclaimer.
-
-    2. Redistributions in binary form must reproduce the above copyright
-       notice, this list of conditions and the following disclaimer in the
-       documentation and/or other materials provided with the distribution.
-
-    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
-    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
-    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-    AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
-    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-    POSSIBILITY OF SUCH DAMAGE.
-*/
+ * Copyright (C) 2018 Michael Muenz <m.muenz@gmail.com>
+ * Copyright (C) 2023 Deciso B.V.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
 
 namespace OPNsense\Bind;
 
 use OPNsense\Base\BaseModel;
+use OPNsense\Core\Backend;
+use Phalcon\Messages\Message;
 
 class General extends BaseModel
 {
+    public function performValidation($validateFullModel = false)
+    {
+        $messages = parent::performValidation($validateFullModel);
+
+        if (
+            ($validateFullModel || $this->enabled->isFieldChanged() || $this->port->isFieldChanged()) &&
+            !empty((string)$this->enabled)
+        ) {
+            foreach (json_decode((new Backend())->configdpRun('service list'), true) as $service) {
+                if (empty($service['dns_ports'])) {
+                    continue;
+                }
+                if ($service['name'] != 'named' && in_array((string)$this->port, $service['dns_ports'])) {
+                    $messages->appendMessage(new Message(
+                        sprintf(gettext('%s is currently using this port.'), $service['description']),
+                        $this->port->getInternalXMLTagName()
+                    ));
+                    break;
+                }
+            }
+        }
+
+        return $messages;
+    }
 }