wallaby: RSA server certificate CommonName (CN) `wallaby.bitmask.net' does NOT match server name!?

root@wallaby:/srv/leap/webapp/log# grep certificate /var/log/apache2/error.log|tail -1
[Sat Aug 03 13:18:08 2013] [warn] RSA server certificate CommonName (CN) `wallaby.bitmask.net' does NOT match server name!?

(from redmine: created on 2013-08-03, closed on 2013-10-06, relates #3916 (closed))