google app engineでdev_appserver.py起動時にエラー

dev_appserver.pyで起動時に
WARNING 2009-10-27 09:08:12,294 datastore_file_stub.py] Could not read datastore data from /tmp/dev_appserver.datastore
WARNING 2009-10-27 09:08:12,295 datastore_file_stub.py] Could not read datastore data from /tmp/dev_appserver.datastore.history
Traceback (most recent call last):
File "./dev_appserver.py", line 60, in
run_file(__file__, globals())
File "./dev_appserver.py", line 57, in run_file
execfile(script_path, globals_)
File "/usr/local/lib/google_appengine/google/appengine/tools/dev_appserver_main.py", line 474, in
sys.exit(main(sys.argv))
File "/usr/local/lib/google_appengine/google/appengine/tools/dev_appserver_main.py", line 453, in main
static_caching=static_caching)
File "/usr/local/lib/google_appengine/google/appengine/tools/dev_appserver.py", line 3209, in CreateServer
return BaseHTTPServer.HTTPServer((serve_address, port), handler_class)
File "/usr/lib/python2.6/SocketServer.py", line 400, in __init__
self.server_bind()
File "/usr/lib/python2.6/BaseHTTPServer.py", line 108, in server_bind
SocketServer.TCPServer.server_bind(self)
File "/usr/lib/python2.6/SocketServer.py", line 411, in server_bind
self.socket.bind(self.server_address)
File "", line 1, in bind
socket.gaierror: [Errno -5] No address associated with hostname
エラーが出たので調べてみたらウブンツはデフォでポートが閉じているみたいなので
下記のコマンドでポート開放

sudo ufw allow 8080/tcp

この設定でも動かなかったので他の原因を探ってみる
http://groups.google.co.jp/group/google-app-engine-japan/browse_thread/thread/09f1122389a5dda3
/etc/hostsの

# The following lines are desirable for IPv6 capable hosts
#::1 127.0.0.1 ip6-localhost ip6-loopback
#fe00::0 ip6-localnet
#ff00::0 ip6-mcastprefix
#ff02::1 ip6-allnodes
#ff02::2 ip6-allrouters
#ff02::3 ip6-allhosts

ipv6以下がまずいのでコメントにして再起動してから試すとうまくうごいた