diff --git a/js/app/AmdaApp.js b/js/app/AmdaApp.js
index fa9782d..53f9a35 100755
--- a/js/app/AmdaApp.js
+++ b/js/app/AmdaApp.js
@@ -440,6 +440,7 @@ Ext.define('amdaApp.AmdaApp', {
 						text : 'Reset password',
 						iconCls : 'icon-resetpwd',
 						id : 'resetpwd-win-tool',
+                        disabled: isGuest || (sessionID == 'impex'),
 						handler : function(obj, e) {
 								e.stopEvent();
 								var moduleId = obj.el.id;
diff --git a/php/classes/AmdaClient.php b/php/classes/AmdaClient.php
index caa3e1f..1db67da 100644
--- a/php/classes/AmdaClient.php
+++ b/php/classes/AmdaClient.php
@@ -249,6 +249,9 @@ class AmdaClient {
 	}
 
     public function resetUserPwd($login, $crt_pwd, $new_pwd) {
+        if ($login == "impex" || str_starts_with($login, "guest")) {
+            return array('success' => false, 'message' => "You are not authorised to change this password");
+        }
         try {
 			$data_array = array(
 				"login" => $login,
--
libgit2 0.21.2