I have an IBM x3400 server, in which i have install windows server 2003 R2 Standard Adition with service pack 2 with SQL 2005 Standard. In this server ERP running on our multiple office. The problem are when i have format my server and install all softwares, then after 2 or three days that are getting Request timed out when I have ping any public network in time interval, and after two days there some unknown service started. and after one week i am unable to login that server and require to formatting. I have install different antivirus software like mcafee total protection, mcafee 7.5, quick heal total protection, spyware terminator, but nothing are working. I have also a hardware firewall Fortigate 50a, in which i have mapped my server public to private network, and open only 1433 and 1433 port. i am also open that port in windows firewall and another all port and web access are totally closed. but after that why my server are infected through virus or spyware. Every two or three weeks i have format my server. I have also call IBM Service and he was also change the system board and HDD of server, but its getting same problem. Please someone help me.