use ssh instead of telnet

The problem

Telnet is insecure and is easier to compromise. It does not use encryption and has not way of verifying identity

The solution

The best solution would to use ssh. ssh is much more secure and would make it harder for anyone to compromise the connection. It also has the benefit of verifying that the identity of the sever has not changed which would protect against someone hijacking the URL.

Temporary workarounds

You should be able to run telnet over ssh so that it is harder to compromise