Telnet

Telnet is a text-oriented communication protocol, one of the oldest protocols still in use. It sends text information to a server and receives text in response. Using Telnet nowadays is utterly insecure, since both Telnet clients and servers do not provide any protection from possible eavesdropping (data interception); all text-based communication should use secure protocols, such as SSH.

However, Telnet clients still are in use; it is convenient to make use of Telnet to imitate and/or debug usage of many a protocol, such as SMTP, POP3 and so on. Telnet is still used in a number of network devices such as DSL modems; it is recommended to watch all Telnet network activity within intranet, since it can be one of the primary targets for security-related exploits and attacks.

Glossary

IPHost features:

SSH Monitor
SSH Monitor is an advanced IPHost Monitor. Use it to run a program (script) on remote host and return results to interpret as performance value. It should be …

SMTP — network mail servers monitoring
SMTP Monitor belongs to more advanced IPHost Monitors. … SMTP Monitor allows to test both basic and extended functionality, along with general connectivity and network latency …

Hardware Monitoring with SSH
There are 4 predefined hardware performance monitors that obtain their data via SSH protocol. You can monitor several CPU load metrics, various memory usage parameters, free or used disk space, or varied process characteristics of any SSH-enabled host.

POP3 Mail Monitor
POP3 Monitor is a simple IPHost Monitor. POP3, or Post Office Protocol version 3, still is a popular protocol used to get email messages from a mail server. …