We are using Umbraco 4.7 and recently we switched over to using https and everything was running smothly.  However, we ran into a problem when the notifcations went out to users.  Previously the links looked similar to www.abc.com:80/umbraco... Now they were looking like www.abc.com:443/umbraco...  This would come across to the web server as http://www.abc.com:443/umbrcao... and the browser would hang or timeout.  I found that if in the browser I typed in https://www.abc.com:443/umbraco... everything was fine.  The solution to fix this was to change souce code.  

File: Umbraco.cms -> workflow -> Notification.cs

I replaced http://  with HttpContext.Current.Request.Url.Scheme + "://".

private static void sendNotification

line 124
            string[] subjectVars = {
                                       HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.ServerVariables["SERVER_NAME"] + ":" + HttpContext.Current.Request.Url.Port.ToString() + IOHelper.ResolveUrl(SystemDirectories.Umbraco), ui.Text(Action.Alias)
                                       ,
                                       documentObject.Text
                                   };

            string[] bodyVars = {
                                    mailingUser.Name, ui.Text(Action.Alias), documentObject.Text, performingUser.Name,
                                    HttpContext.Current.Request.ServerVariables["SERVER_NAME"] + ":" + HttpContext.Current.Request.Url.Port.ToString() +IOHelper.ResolveUrl(SystemDirectories.Umbraco),
                                    documentObject.Id.ToString(), summary.ToString(), 
                                    String.Format(HttpContext.Current.Request.Url.Scheme + "://{0}/{1}", 
                                        HttpContext.Current.Request.ServerVariables["SERVER_NAME"] + ":" + HttpContext.Current.Request.Url.Port.ToString(), 
                                        /*umbraco.library.NiceUrl(documentObject.Id))*/ documentObject.Id.ToString() + ".aspx")

line 166
            string domain = HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.ServerVariables["SERVER_NAME"] + ":" + HttpContext.Current.Request.Url.Port.ToString() + "/";

<area alias="notifications" version="2.1">
  ...
  <key alias="mailBody" version="2.1">
    ...
    Go to https://%4%/actions/editContent.aspx?id=%5% to edit.
    ...
  </key>
  <key alias="mailBodyHtml" version="3.0">
    ...
                <a style="color: white; font-weight: bold; background-color: #66cc66; text-decoration : none; margin-right: 20px; border: 8px solid #66cc66; width: 150px;" href="https://%4%/actions/publish.aspx?id=%5%">&nbsp;&nbsp;PUBLISH&nbsp;&nbsp;</a> &nbsp; 
                <a style="color: white; font-weight: bold; background-color: #5372c3; text-decoration : none; margin-right: 20px; border: 8px solid #5372c3; width: 150px;" href="https://%4%/actions/editContent.aspx?id=%5%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;EDIT&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</a> &nbsp; 
                <a style="color: white; font-weight: bold; background-color: #ca4a4a; text-decoration : none; margin-right: 20px; border: 8px solid #ca4a4a; width: 150px;" href="https://%4%/actions/delete.aspx?id=%5%">&nbsp;&nbsp;&nbsp;&nbsp;DELETE&nbsp;&nbsp;&nbsp;&nbsp;</a>
    ...
  </key>
  ...
</area>