The only other thing I can suggest outside of reading the RFC's for basic tcp networking is to check that your vpn routes are correct and assuming your connecting through the vpn your initiating localhost on the correct server or typing in the remote server's IP addres with the application bound to 0.0.0.0 not 127.0.0.1.
Here is a situation: 2 RV042 units connected as site to site VPN. 1 location 192.168.101.0/24 and the other 192.168.102.0/24. They connect fine and I can ping across the tunnel. On the 102 end I have a device (not a PC) using port 3001. I can telnet to it locally and also remotely using its public Installing and Starting the Telnet Gateway Server Software The Telnet Gateway server is part of the VPN Solutions Center Network Management Subnet. One or more Telnet Gateway Server hosts can be connected on a LAN to the VPN Solutions Center workstation. This chapter describes how to install, start, and uninstall the Telnet Gateway Server software. VPN | Office of Information Technology Although we do not recommend using insecure FTP, if it's necessary to FTP to an on-campus resource, you must connect to the VPN server first to create a secure path; You must also connect to the VPN server first to use Telnet to access an on-campus resource; e.g. SPSS on lynx.uccs.edu; Utilize some College or Department specific resources
How to Use the Telnet Client in Windows
AnyConnect VPN Client Troubleshooting Guide - Common Aug 30, 2018 What is Telnet (TN)? - Definition from Techopedia
Mar 31, 2020
You have been successfully authenticated. You have been successfully authenticated. Therefore, don't use telnet. If you want to do a safe telnet, you must use a VPN that goes from your home machine to the ultimate destination server (the webhotel). Generally speaking you should use SSH in preference to Telnet in all circumstances, if security is a priority. That depends a lot on what vpn and what are you TELNET'ing to. Whilst inside the VPN tunnel, your traffic is encrypted and secure, however as soon as you emerge from the other side of that tunnel, your traffic turns straight back into regular unsafe TELNET traffic again. Here is a situation: 2 RV042 units connected as site to site VPN. 1 location 192.168.101.0/24 and the other 192.168.102.0/24. They connect fine and I can ping across the tunnel. On the 102 end I have a device (not a PC) using port 3001. I can telnet to it locally and also remotely using its public May 11, 2020 · AbsoluteTelnet provides Telnet, SSH, SSH2, SFTP, dialup, and serial connectivity in the new tabbed multi-session interface or the classic single-session IPVanish VPN Best for zero logs. Number Mar 31, 2020 · Ryan Perian Telnet is a network protocol that provides a command-line interface to communicate with a device. Telnet is used most often for remote management but also sometimes for the initial setup for some devices, especially network hardware such as switches and access points. Telnet is also used to manage files on a website. The word “Telnet” also refers to the command-line utility “telnet”, available under Windows OS and Unix-like systems, including Mac, Linux, and others. We will use the term “Telnet” mostly in the context of the telnet client software.