Hi,
I've already create inbound/outbound rule on port 8000, to the client machine (which is Windows 8.1), but I have got these

C:\Users\Peter>telnet hpi5.huamin.com 8000
Connecting To hpi5.huamin.com...Could not open connection to the host, on port 8000: Connect failed

C:\Users\Peter>ping hpi5.huamin.com

Pinging hpi5.huamin.com [113.255.249.122] with 32 bytes of data:
Reply from 113.255.249.122: bytes=32 time<1ms TTL=64
Reply from 113.255.249.122: bytes=32 time<1ms TTL=64
Reply from 113.255.249.122: bytes=32 time<1ms TTL=64
Reply from 113.255.249.122: bytes=32 time=5ms TTL=64

Ping statistics for 113.255.249.122:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 5ms, Average = 1ms

when I'm to telnet the Red hat server. How to resolve this?

what is listening on port 8000?

As I cannot run the Oracle Form from Server machine, on client machine, while Oracle form does work through Port 8000. This is why I try the way to telnet through port 8000.

Show us:
on the server. Also, what OS the server is running.
This will give us the firewall configuration and show us if any process is listening on port 8000 on the server.

If the ss command doesn't exist, use netstat (same parameters).

will show

redhat should have the very old telnet disabled ( turned off) by default

did you re-enable it ?

telnet is a major security nightmare , use EXTREME CAUTION

Don't forget that you pay for Red Hat support...

What version of RHEL is this?

Depending on the version of RHEL, Telnet may not come installed by default.

or

If Telnet is installed, check if it is running:

As others have said Telnet is insecure, however its good to check and see if ports are open and/or a session can be established with a remote machine.

Many thanks all.
I have done these

[oracle@hpi5 ~]$ yum info telnet
Loaded plugins: rhnplugin, security
*Note* Unbreakable Linux Network repositories are not listed below. You must run this command as root to access ULN repositories.
adobe-linux-i386 2/2
el5_latest 12794/12794
el5_unsupported 1173/1173
ol5_u7_base 3782/3782
Installed Packages
Name : telnet
Arch : i386
Epoch : 1
Version : 0.17
Release : 41.el5
Size : 96 k
Repo : installed
Summary : The client program for the telnet remote login protocol.
License : BSD
Description: Telnet is a popular protocol for logging into remote systems over the
: Internet. The telnet package provides a command line telnet client.

[oracle@hpi5 ~]$ ps -ef | grep -i telnetd
oracle 3718 3490 0 09:16 pts/2 00:00:00 grep -i telnetd
[oracle@hpi5 ~]$ cd /sbin
[oracle@hpi5 sbin]$ ./ifconfig -a
eth0 Link encap:Ethernet HWaddr 08:00:27:61:4D:E0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:402 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:45620 (44.5 KiB) TX bytes:1710 (1.6 KiB)

eth1 Link encap:Ethernet HWaddr 08:00:27:77:0F:E4
inet addr:113.255.242.82 Bcast:113.255.255.255 Mask:255.255.240.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4520 errors:0 dropped:0 overruns:0 frame:0
TX packets:1828 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3006195 (2.8 MiB) TX bytes:260813 (254.7 KiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:6922 errors:0 dropped:0 overruns:0 frame:0
TX packets:6922 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:8712960 (8.3 MiB) TX bytes:8712960 (8.3 MiB)

virbr0 Link encap:Ethernet HWaddr 967:1C:46:4D:A4
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:3485 (3.4 KiB)

but I still cannot telnet the server on client machine.

You need to use code tags to make what you post more readable.

From what you posted below, Telnet daemon is NOT running.

How to enable it?

You don't need telnetd, since you want to access port 8000. You shouldn't run it anyway. The telnet client is useful for quick checks, the telnet server is useless.

What you need to do is check if port 8000 is open and if somebody listens on it. See replies 4 and 5.

Thanks. Any advice to the following?

[oracle@hpi5 sbin]$ iptables -S
bash: iptables: command not found
[oracle@hpi5 sbin]$ ss -lntp | grep 8000
bash: ss: command not found
[oracle@hpi5 sbin]$
[oracle@hpi5 sbin]$ lsof -i :8000
bash: lsof: command not found

according to the given advice on #4 and #5.

netstat -a | grep 8000

I've done such command on server fine. But I still get same problem to telnet server on port 8000 on client machine.