Curious if it is possible to telnet into a SSH server or SSH into a telnet server ?

If so, how would you do this ?

The ssh port is 22 if I remember correctly, so just run:
telnet hostname 22

Ofcourse once you are connected you'll need to be able to do a few calculations to complete the threeway handshake. But if you are a master at cyrptography algorithms then I'm sure you can keep up with that. After that you can use the common secret in combination with your private key to send data to the server and you can use the servers public key to decrypt the data from the server. If you got that far then you are talking to the ssh server through telnet.

If you ssh into a telnet server then the ssh client and the telnet server will just both be confused because they are both speaking different languages.

telnet and ssh are really kind of different... if a server is only running telnet, you couldn't ssh into it and vice versa from my understanding... but ssh might be able to understand telnet. never tried really..

like Mik says, basically no....

though telnetting into port 22 will show you what ssh protocol the sshd is using - possibly useful info.

oops, forgot about this thread, too much studying lately.

Anyways, thanks for the helpful info guys, i'll check it out now and see how that goes.