I have installed and enabled Telnet server on Mandrake 10 on VMware4. When I try to telnet from a Windows machine, it tried for a while and died. When I tried to Telnet from a Cisco Router, it says Connection Closed by Foreign host.

I did a netstat and see the following.

It looks like my Windows telnet client reaches the Linux machine. For some reason, the Linux server is waiting for someting. -- tcp 0 0 computername:telnet w2wz3n9v
01.txpln.u:2548 TIME_WAIT

Active Internet connections (servers and established
)
Proto Recv-Q Send-Q Local Address Foreign
Address State
tcp 0 0 localhost:32768 *:*
LISTEN
tcp 0 0 *:sunrpc *:*
LISTEN
tcp 0 0 *:x11 *:*
LISTEN
tcp 0 0 *:telnet *:*
LISTEN
tcp 0 0 computername:telnet w2wz3n9v
01.txpln.u:2548 TIME_WAIT
tcp 0 0 *:ssh *:*
LISTEN
udp 0 0 *:bootpc *:*

udp 0 0 *:sunrpc *:*

This sounds like you need to place the IP address and system name of the Windows system in the Linux systems /etc/hosts file

a typical /etc/hosts file will have something like:

127.0.0.1 localhost
192.168.1.10 xbert
192.168.1.27 dilbert
192.168.1.53 catbert

the first two lines should be to ID the linux system that this file is on
the next lines will be the IP address of units you want to connect to it and their names

I've found and fixed the problem. Looks like if I set the "Level and Checks" to Higher, It will prevent me from accessing the Linux services, including Telnet and VNC, even though I have configure the firewall to allow all the services.

Weird. Anybody have any thought on this issue?

Thanks.

Kim