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I have been observing in 'application log' from 'event viewer'. It comes to my notice that some body is trying to trace the password of my sqlserver. I think for hacking the database the user might be using a program for tracing username and password, this comes to my notice because log shows every millisecond's event (audit failure). The user logs in from IP 213.16.19.14 and uses username 'sa' at the same time he logs in from IP 80.93.230.82 and uses username 'albatross' or 'password'.<br />
Please tell me<br />
1. How is it happening?<br />
2. How to block or restrict these two IPs(213.16.19.14 &amp;&nbsp;80.93.230.82)<br />
3. How to protect my sqlserver from hackers? 
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I have been observing in 'application log' from 'event viewer'. It comes to my notice that some body is trying to trace the password of my sqlserver. I think for hacking the database the user might be using a program for tracing username and password, this comes to my notice because log shows every millisecond's event (audit failure). The user logs in from IP 213.16.19.14 and uses username 'sa' at the same time he logs in from IP 80.93.230.82 and uses username 'albatross' or 'password'.
Please tell me
1. How is it happening?
2. How to block or restrict these two IPs(213.16.19.14 & 80.93.230.82)
3. How to protect my sqlserver from hackers? 

how to block an IP

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.

OS Security

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.