Episerver Will give YSOD when publishing pages: Cannot save ACL with no page link set. This could be due to a page provider not properly setting PageLink.

gistfile1.cs

protected void Application_Start(Object sender, EventArgs e)
{
    DataFactory.Instance.PublishedPage += Publishing_Page;
}

private void Publishing_Page(object sender, PageEventArgs e)
{
    e.Page.ACL.Add(new AccessControlEntry("MyGroup", AccessLevel.FullAccess, SecurityEntityType.Role));
    e.Page.ACL.Save(SecuritySaveType.Replace);
}