With the telnet program one can connect to any TCP port on any host, but is there a way to listen on some port on current host?
i.e.
1) on host a: telnet listen 12345
2) on host b: telnet host_a 12345
I don't want any service behind the listening side, just connection and whatever typed to be transferred as is both ways.
I know I can already do the 2), but is there any way to achieve the 1)? I'm interested in both Windows and Linux solution.
How can I check if a port is listening on a Linux server?
I need to check that an OpenVPN (UDP) server is up and accessible on a given host:port.
I only have a plain Windows XP computer with no OpenVPN client (and no chance to install it) and no keys needed to connect to the server - just common WinXP command line tools, a browser and PuTTY are in my disposition.
If I was testing something like an SMTP or POP3 servert I'd use telnet and see if it responds, but how to do this with OpenVPN (UDP)?
on Windows XP/server 2003
When telnet some remote host on a specified port, after connection established, sometimes press ctrl+] doesn't quit. Is there any command can quit instead of just close the command line window? Thanks.
EDIT: But sometimes even type ctrl + ], telnet command line doesn't show up, still stuck at the blank screen.
I administer a number of linux servers that require telnet access for users. Currently the user's credentials are stored locally on each server and the passwords tend to be very weak and there is no requirement for them to be changed. The logons will soon be integrated with Active Directory and this is a more closely guarded identity.
Is it really a concern that user's password could be sniffed from the LAN given that we have a fully switched network so any hacker would need to insert themselves physically between the user's computer and the server?