diff --git a/brozzler/browser.py b/brozzler/browser.py
index ef7885e..0302da5 100644
--- a/brozzler/browser.py
+++ b/brozzler/browser.py
@@ -244,8 +244,11 @@ class WebsockReceiverThread(threading.Thread):
                 # AITFIVE-1529: handle http auth
                 # we should kill the browser when we receive Page.interstitialShown and
                 # consider the page finished, until this is fixed: https://bugs.chromium.org/p/chromium/issues/detail?id=764505
-                self.logger.info('Page.interstitialShown received: likely http auth request, currently unsupported')
-                brozzler.thread_raise(self.calling_thread, BrowsingException)
+                self.page_interstitial_shown = brozzler.PageInterstitialShown(
+                        warcprox_meta=None)
+                self.logger.info('Page.interstialShown (likely http auth request) %s', self.page_interstitial_shown)
+                brozzler.thread_raise(
+                        self.calling_thread, brozzler.PageInterstitialShown)
             elif message['method'] == 'Inspector.targetCrashed':
                 self.logger.error(
                         '''chrome tab went "aw snap" or "he's dead jim"!''')