Hi.. We found that our Linux server was down last night and before that our Linux Anti-Virus server (TrendMicro SPLX ServerProtect for Linux) was sending us the Virus found notification as followiing Virus found! Action: Clean failed, Quarantined. ELF_ROOTKIT.A found in file: ptrace A virus infection was detected It state quaratined but I don't know why the server still went down. After we up the server , we delete the virus files and scan again. It does detect anything. Does anyone know about this virus? and what possible damage will it cause? and how it came in ? __________________________________ Start your day with Yahoo! - Make it your home page! http://www.yahoo.com/r/hs