LINUX : telnet/pop/ftp problem

[utkarsh joshi <j_utkarsh@yahoo.com>]

HI there,
Our web/email server suddenly have a problem to
recieve any telnet, ftp, pop connections. Inetd is up
and running. If we use telnet/ftp/pop , client gets
connected and the server closes connection
immediately.
after 
  Escape character is '^]'.
I also tried it from console to localhost/IP
address/hostname with no luck. (so no external
firewall issue)NO ipchains/iptables on box itself.
Rebooted server many times.
BTW it's linux 5.0 with 2.0.32 Kernel.It is running
for last 3 years and nobody has touched the
configuration .
I checked dns services and it's working fine. Sendmail
and apache are also fine.The only thing I observed is 
netstat -a takes long time to give output.

Any suggestions?

Utkarsh..
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