Hello Patong,
Your IP 114.109.205.23 was again blocked in server firewall due to virus upload attempt. Now i have removed the blocked. Please have a try again to login WHM
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csf.deny: 114.109.205.23 # Virus upload attempt - Blocked by apache-modsec - Tue Dec 23 09:09:34 2014
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Kindly check your local machine for any virus/infected files or malware which is causing this. Please let us know if you need any further assistance.