diff -u rhn-client-tools-1.8.26/debian/changelog rhn-client-tools-1.8.26/debian/changelog
--- rhn-client-tools-1.8.26/debian/changelog
+++ rhn-client-tools-1.8.26/debian/changelog
@@ -1,3 +1,13 @@
+rhn-client-tools (1.8.26-4) unstable; urgency=medium
+
+  * [e3525938] Fix installTime function for multiarch.
+    This should avoid to send None as timestamp via
+    xmlrpc, which resulted in a traceback due to changes in
+    xmlrpc, breaking spacewalk support.
+    Thanks to Klaas Demter and Philipp Born (Closes: #728365)
+
+ -- Bernd Zeimetz <bzed@debian.org>  Sat, 24 Jan 2015 09:39:24 +0100
+
 rhn-client-tools (1.8.26-3) unstable; urgency=medium
 
   * [11430f4f] Merge branch 'master' of
only in patch2:
unchanged:
--- rhn-client-tools-1.8.26.orig/debian/patches/installTime_multiarch_fix
+++ rhn-client-tools-1.8.26/debian/patches/installTime_multiarch_fix
@@ -0,0 +1,32 @@
+--- a/src/up2date_client/debUtils.py
++++ b/src/up2date_client/debUtils.py
+@@ -34,12 +34,14 @@ def parseVRE(version):
+         release = tmp[-1]
+     return version, release, epoch
+ 
+-def installTime(pkg_name):
+-    path = '/var/lib/dpkg/info/%s.list' % pkg_name
+-    if os.path.isfile(path):
+-       return os.path.getmtime(path)
+-    else:
+-       return None
++def installTime(pkg_name, arch=None):
++    paths = ['/var/lib/dpkg/info/%s.list' % (pkg_name,)]
++    if arch:
++        paths.append('/var/lib/dpkg/info/%s:%s.list' % (pkg_name, arch))
++    for path in paths:
++        if os.path.isfile(path):
++           return os.path.getmtime(path)
++    return None
+ 
+ #FIXME: Using Apt cache might not be an ultimate solution.
+ # It could be better to parse /var/lib/dpkg/status manually.
+@@ -70,7 +72,7 @@ def getInstalledPackageList(msgCallback
+             'version': version,
+             'release': release,
+             'arch': pkg.installed.architecture + '-deb',
+-            'installtime': installTime(pkg.name)
++            'installtime': installTime(pkg.name, pkg.installed.architecture)
+             }
+         pkg_list.append(package)
+ 
only in patch2:
unchanged:
--- rhn-client-tools-1.8.26.orig/debian/patches/series
+++ rhn-client-tools-1.8.26/debian/patches/series
@@ -0,0 +1 @@
+installTime_multiarch_fix