Is it hack? How to prevent!

[The Happy]

Hello everyone,

    I'm on freebsd 4.8R acting as a webserver and email server, I keep 
getting
    In my /var/log/messages a strange 3 type of messages,

1)
   mysqld[8541]: error: /etc/hosts.allow, line 212: twist option in resident 
process
   last message repeated 73 times

2)
  inetd[50977]: warning: /etc/hosts.allow, line 25: host name/address 
mismatch: 208.34.235.251 !=
  mail.nrms.org

3)
  sshd[40712]: warning: /etc/hosts.allow, line 25: can't verify hostname: 
getaddrinfo(na-163-
  219.na.avantel.net.mx, AF_INET) failed
  (I keep getting differnt host everytime)

  about messages 2 and 3 i think its some hacks attempts How i can preven 
this type of
  access? unmatched IPs?

  what about messages number 1? what doest mean is it hack attempt?

  My logs are full of these messages, please help
  Note line 25 in /etc/hosts.allow is ALL : .temma.net : deny and has 
nothing to do with these logs
  its just the first rule in the file.

  Thank you in advance.

  Marwan

_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today it's FREE! 
http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/