Questions about using telnet to my host port

darkfire1986

I opened two ports on the machine as two service programs written by others. When these two programs are opened, telnet these two ports on my host, but the results are different, one is telnet After successful, press the Enter key, there is a response, return to OK. After another telnet succeeds, press Enter, nothing happens. Others are the same.
What's going on?

sh280303120

Bangding

ricoll

This mainly depends on whether the service of the port provides Shell for TELNET, which is related to the program itself.