How to use telnet to test connectivity to TCP ports

2019年11月8日 — Two popular tools for testing network services on a basic level are telnet and Netcat. Here's how to use them.

Try our articles on network troubleshooting using curl or using PowerShell and tnc. Just about every computer will have one of these three programs installed.

2023年12月6日 — This article explains how to check whether or not ports are open (using the Telnet application).

2023年6月13日 — The telnet application is widely used to verify connectivity to remote services that are based on TCP and can be used to monitor firewalls!

2022年9月21日 — I get this: ITRyg...02>telnet 10.10.10.10 8888. Trying 10.10.10.10... Connected to 10.10.10.10. Escape character is 'off'.

2022年8月18日 — 登入 $ telnet 127.0.0.1 143 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. * OK [CAPABILITY IMAP4 IMAP4rev1 ...

2018年9月23日 — This article provides you with the steps to use the Telnet utility to test connectivity to different ports on your servers from Windows, Linux, ...

2020年7月8日 — Use telnet to troubleshoot connection problems with your voyager server. Syntax is: telnet <url/ip> <port>

2023年5月16日 — When it comes to checking if a network port is opened or closed on a remote computer, there's no easier way than to use telnet.

2013年10月1日 — ... telnet 也是很重要的。 下面示範如何測試 192.168.5.5 這台伺服器的SMTP port（port 25）是否正常： telnet 192.168.5.5 25. 輸出為. Trying 192.168.