Error: 18456, Severity: 14, State: 8 on sql server 2008 R2 and SAP Business one

Dear Expert,

i have trouble about error log server, the error are

02/19/2014 11:29:19,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:19,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:18,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:18,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:17,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:17,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:16,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:16,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:15,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:15,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:14,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:14,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:13,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:13,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:12,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:12,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:12,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:12,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:11,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:11,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:10,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:10,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:09,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:09,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:08,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2] 02/19/2014 11:29:08,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8. 02/19/2014 11:29:07,Logon,Unknown,Login failed for user 'sa'. Reason: Password did not match that for the login provided. [CLIENT: 61.132.220.2]

02/19/2014 11:29:07,Logon,Unknown,Error: 18456<c/> Severity: 14<c/> State: 8.

after 8 hours sap business one not responding, or database in sql server suspended and user cannot run transaction.

when i check the ip on ip-lookup, show location country is chiness, did any one has experience about this problem

this error using SQL Server 2008 R2 and SAP Business one 9.0 PL 7.

Please for feedback

i attach log file sql server