How Sitecore Phones Home (maybe)

A question came up today around the office: does Sitecore monitor their installation base via a phone-home mechanism of some kind?  It’s relevant in a number of ways.   One way being as we work on cloud installations and elastic models for Sitecore, what data might Sitecore have that we could leverage for tracking licensing compliance, utilization, etc.

There may be other ways Sitecore tracks their server activities, but I used Reflector on the Sitecore.sitecore.login namespace to find one very likely place where Sitecore implements a call-back to the mothership.  Here goes . . .

Using a clean Sitecore 8.1 rev 151207 installation, in the source for the sitecore/login/default.aspx page is the following mark-up.  Note the “display:none;” on line 1 that hides this div from view:

   1:      <div id="licenseOptions" style="display: none;">
   2:  <%--            <h2 class="form-signin-heading">License and browser information</h2>--%>
   3:              <div class="license-info-wrap">
   4:                <ul>
   5:                  <li>System information</li>
   6:                  <li>License holder <%# License.Licensee %></li>
   7:                  <li>License ID <%# License.LicenseID %></li>
   8:                  <li>Sitecore version <%# About.VersionInformation() %></li>
   9:                </ul>
  11:                <iframe id="StartPage" runat="server" allowtransparency="true" frameborder="0" scrolling="auto"
  12:                      marginheight="0" marginwidth="0" style="display: none; height: 105px;"></iframe>
  14:              </div>
  15:              <div class="login-link-wrap">
  16:                <a href="javascript:;" id="licenseOptionsBack" class="login-link">&lt; Back</a>
  17:              </div>
  19:            </div>

If we remove the “display:none” and load the page, some interesting details about the environment are revealed.  On my local machine it appears like this:


That’s not particularly interesting, but if you return to the mark-up and examine the IFrame defined on line #11 named StartPage with the runat=server attribute, you might turn your attention to what’s going on server-side when this default.aspx page loads.

Reflector, or any decompiler, will show that Sitecore.sitecore.login.Default contains an OnInit method with various checks for authentication, databinding, and so on.  I’ll omit most of that method except for the one call that’s of interest here, as we look for a way our local Sitecore system could communicate back to Sitecore the company.

protected override void OnInit(EventArgs e)



Diving into the RenderSdnInfoPage method, we have this:

   1:  private void RenderSdnInfoPage()
   2:  {
   3:      this.StartPage.Attributes["src"] = new UrlString(Settings.Login.SitecoreUrl) {
   4:          ["id"] = Sitecore.SecurityModel.License.License.LicenseID,
   5:          ["host"] = WebUtil.GetHostName(),
   6:          ["licensee"] = Sitecore.SecurityModel.License.License.Licensee,
   7:          ["iisname"] = WebUtil.GetIISName(),
   8:          ["st"] = WebUtil.GetCookieValue("sitecore_starttab", string.Empty),
   9:          ["sc_lang"] = Context.Language.Name,
  10:          ["v"] = About.GetVersionNumber(true)
  11:      }.ToString();
  12:      this.StartPage.Attributes["onload"] = "'block'";
  13:  }

And now we’re in business!  Sitecore loads up various pieces of data from the local running Sitecore instance and appends it to the end of our URL that we inject into the src attribute of the IFrame.  That src attribute in a default Sitecore installation starts with (defined as the Login.SitecoreUrl configuration setting) and the rest of the URL is information communicated to Sitecore about this local instance.

For example, using my Firefox HTML Inspector, my generated IFrame source was as follows (know that I have altered identifying information about my license):

<i frame src=”” id=”StartPage” allowtransparency=”true” scrolling=”auto” marginheight=”0″ marginwidth=”0″ style=”display: block; height: 105px;” onload=”’block'” frameborder=”0″></i frame>

I think it’s a pretty safe bet that startpage.aspx on the site has some logic running to catalog the querystring parameters and passively monitor what’s going on in the wild.

One thought on “How Sitecore Phones Home (maybe)

  1. Richard Dias October 19, 2017 / 12:13 pm

    Yeah, you’re correct. It’s always been the start page that pings back to Sitecore. Just have a look at the ‘network’ tab in firebug or google dev tools.

    Wonder what happens if you add a local host entry for the ping back URL 🙂

    Liked by 1 person

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