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you were right! I freaked out over nothing.
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you were right! I freaked out over nothing.

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HELP!! - I'm not good at this - I have this entry in /var/spool/mail/root<br />
<br />
users logging in through sshd: <br />
&nbsp; &nbsp;root:<br />
&nbsp; &nbsp; &nbsp; 172.16.26.113 (itw-ws-0017.mydomain.com ) : 1 time<br />
** unmatched entries **<br />
warning /etc/hosts.allow line 14: missing &quot;:&quot; separator : 1 time (s) <br />
address 172.16.26.113 maps to itw-ws-mydomain.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT! : 1 time (s)<br />
<br />
how can i see if this is a real possible break in? &nbsp;Also - is there a way to see who is logged in to 172.16.26.113 using the ip address?
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HELP!! - I'm not good at this - I have this entry in /var/spool/mail/root

users logging in through sshd: 
   root:
      172.16.26.113 (itw-ws-0017.mydomain.com ) : 1 time
** unmatched entries **
warning /etc/hosts.allow line 14: missing ":" separator : 1 time (s) 
address 172.16.26.113 maps to itw-ws-mydomain.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT! : 1 time (s)

how can i see if this is a real possible break in?  Also - is there a way to see who is logged in to 172.16.26.113 using the ip address?

fedora

The Linux operating system, in all its flavors, has its own share of security flaws that allow intrusions, but there are various mechanisms by which these flaws can be removed, generally divided into two parts: authentication and access control. Authentication is responsible for ensuring that a user requesting access to the system is really the user with the account, while access control is responsible for controlling which resources each account has access to and what kind of access is permitted.

Linux Security

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.

Security

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.