Strange 301 redirect in server log

Hi

I saw these entries in my server logs 

2014-09-20 01:31:23 W3SVC8 23.239.200.27 GET / - 80 - 68.171.222.84 - - 301 0 0 390 41 40
2014-09-20 01:31:23 W3SVC8 23.239.200.27 GET /wp-login.php - 80 - 68.171.222.84 - - 301 0 0 414 53 33
2014-09-20 01:31:23 W3SVC8 23.239.200.27 GET /administrator/index.php - 80 - 68.171.222.84 - - 301 0 0 436 64 39
2014-09-20 01:31:23 W3SVC8 23.239.200.27 GET /user - 80 - 68.171.222.84 - - 301 0 0 398 45 36
2014-09-20 01:31:23 W3SVC8 23.239.200.27 GET /admin.php - 80 - 68.171.222.84 - - 301 0 0 408 50 33

I don't have any php page on my server.

Why they are 301 redirect and where these traffics come from?

Thanks