Advanced Information Assurance Handbook 3
Wapiti-eater writes "Released 7th April by the CERT Coordination Center, the Advanced Information Assurance Handbook looks to be a good general coverage, how-to type starting point (283 pages). 'This handbook (pdf) is for technical staff members charged with administering and securing information systems and networks.' Dealing primarily with Win2K and Redhat systems, it contains good information applicable to almost any public facing system."
Hmmm. (Score:4, Informative)
Seriously, though, there does seem to be a lot of good, if occasionally basic, advice here. I remember going through the guides the NSA compiled [conxion.com] (warning: obnoxious legalese popup) ages ago, and I see some of the same advice here, e.g. remove the OS/2 and POSIX subsystems, etc.