Log error - Suggestions

Can I please get suggestions on what this means and steps to correct it. (3.211.63-7)

[2013-09-01 09:51:58] NOTICE[6751] manager.c: 127.0.0.1 tried to authenticate with nonexistent user ‘admin’
[2013-09-01 09:51:58] NOTICE[6751] manager.c: 127.0.0.1 failed to authenticate as ‘admin’
[2013-09-01 09:52:03] NOTICE[6752] manager.c: 127.0.0.1 tried to authenticate with nonexistent user ‘admin’
[2013-09-01 09:52:03] NOTICE[6752] manager.c: 127.0.0.1 failed to authenticate as ‘admin’
[2013-09-01 09:52:08] NOTICE[6753] manager.c: 127.0.0.1 tried to authenticate with nonexistent user ‘admin’
[2013-09-01 09:52:08] NOTICE[6753] manager.c: 127.0.0.1 failed to authenticate as ‘admin’
[2013-09-01 09:52:13] NOTICE[6754] manager.c: 127.0.0.1 tried to authenticate with nonexistent user ‘admin’
[2013-09-01 09:52:13] NOTICE[6754] manager.c: 127.0.0.1 failed to authenticate as ‘admin’
[2013-09-01 09:52:18] NOTICE[6755] manager.c: 127.0.0.1 tried to authenticate with nonexistent user ‘admin’
[2013-09-01 09:52:18] NOTICE[6755] manager.c: 127.0.0.1 failed to authenticate as ‘admin’
[2013-09-01 09:52:18] NOTICE[6757] manager.c: Seems to have passed…
[2013-09-01 09:52:19] NOTICE[6759] manager.c: Seems to have passed…

Someone is trying to login to the AMI as the admin user and failing.