You may see each character you type in a Telnet session appear twice or none of your characters appear at all if Termius incorrectly detected whether local echo should be on or off.
When local echo is on, Termius echoes (shows) each character you type on the screen. Local echo is on when Termius doesn't expect the server to echo the characters. When local echo is off, Termius doesn't echo any characters, but rather simply send them to the server because it expects the server to echo characters.
Termius expects the server to echo when it receives the following commands from the server:
Character duplicates will appear when both Termius and the server echo characters. Characters won't appear at all when both Termius or server don't echo them.
Configuring the server in a way that it sends
WILL ECHO or
DON'T ECHO should solve the issue. Either command will disable local echo on the client's (Termius) side.
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