diff --git a/python/samba/netcmd/domain_backup.py b/python/samba/netcmd/domain_backup.py
index 9c8457db4b8..683e7d2684b 100644
--- a/python/samba/netcmd/domain_backup.py
+++ b/python/samba/netcmd/domain_backup.py
@@ -245,7 +245,7 @@ class cmd_domain_backup_online(samba.netcmd.Command):
 
         # Grab the remote DC's sysvol files and bundle them into a tar file
         sysvol_tar = os.path.join(tmpdir, 'sysvol.tar.gz')
-        smb_conn = smb.SMB(server, "sysvol", lp=lp, creds=creds)
+        smb_conn = smb.SMB(server, "sysvol", lp=lp, creds=creds, sign=True)
         backup_online(smb_conn, sysvol_tar, remote_sam.get_domain_sid())
 
         # remove the default sysvol files created by the clone (we want to
@@ -768,7 +768,7 @@ class cmd_domain_backup_rename(samba.netcmd.Command):
         # use the old realm) backed here, as well as default files generated
         # for the new realm as part of the clone/join.
         sysvol_tar = os.path.join(tmpdir, 'sysvol.tar.gz')
-        smb_conn = smb.SMB(server, "sysvol", lp=lp, creds=creds)
+        smb_conn = smb.SMB(server, "sysvol", lp=lp, creds=creds, sign=True)
         backup_online(smb_conn, sysvol_tar, remote_sam.get_domain_sid())
 
         # connect to the local DB (making sure we use the new/renamed config)