diff --git a/Plain Craft Launcher 2/Pages/PageVersion/PageVersionSetup.xaml.vb b/Plain Craft Launcher 2/Pages/PageVersion/PageVersionSetup.xaml.vb
index a11595b..3e01fe4 100644
--- a/Plain Craft Launcher 2/Pages/PageVersion/PageVersionSetup.xaml.vb	
+++ b/Plain Craft Launcher 2/Pages/PageVersion/PageVersionSetup.xaml.vb	
@@ -399,6 +399,14 @@ PreFin:
         TextServerAuthName.Text = "LittleSkin 登录"
     End Sub
 
+    Private Shared Sub TextServerEnter_Change(sender As MyTextBox, e As Object) Handles TextServerEnter.LostFocus
+        If sender.Text.ContainsF("：") Then
+            If MyMsgBox("你似乎将服务器地址中的冒号打成了全角冒号，这可能会导致你无法进入服务器！" & vbCrLf & vbCrLf & "是否要将其替换为半角冒号？",
+                     "警告", Button1:="确定", Button2:="取消", IsWarn:=True) = 1 Then
+                sender.Text = sender.Text.Replace("：", ":")
+            End If
+        End If
+    End Sub
 #End Region
 
 #Region "Java 选择"