Hi,

I have a Linux server that needs to telnet to 8080 port of a remote Linux server.
It takes around 10 seconds to establish telnet connection to this port or other ports like 22.
I have read that this maybe DNS reverse lookup for my ip on remote server.
Unfortunately I do not have any access to the remote serve to check it.
For test I disconnected server cable and connected to my laptop and set the same IP on its interface and tried with telnet utility from windows, but it connected without any delay.
I tested the same with linux telnet from my laptop but there was delay.
I need to know is there any difference between linux and windows telnet client in this regard.
Thanks in advance.

How about stanrdard telnet port, 23? Is there delay?

telnet service is off on the remote server

I think it is rather related to the different hostnames or the different host name resolutions (instead of the client itself)

You should test telnet service on local server, I tested the same with linux telnet from my laptop but there was delay.
I doubt 8080 telnet port, non-standard port, cause the issue.