hi users,
My system IP is 172.31.19.22. When I try to telnet to my system, I get
Trying 172.31.19.22... Connected to localhost.localdomain (172.31.19.22). Escape character is '^]'. Connection closed by foreign host.
Can any one guess the reason.
Guess #1: Nothing is listening on port 23 (neither telnetd itself nor inetd). Check with "netstat -l" (there are other ways too).
Guess #2: An entry in /etc/hosts.deny blocks access.
Guess #3: inetd is listening on the port, but one of the apps it needs to hand off control to (maybe tcpwrappers; maybe telnetd; depends on unreported details of your setup) is either not present or has incorrect permissions.
Guess #4: There is a problem of some sort with reverse lookup of the source address. You've offered too little info for anything more than the general comment, but you might check your logs to see how (even if) the unsuccessful telnet attempt is being logged. (What command are you entering to try to connect? If I "telnet localhost" on any of my systems, it tries to use the lo interface (127.0.0.1), not the eth0 interface.) How long is the delay between the "Escape character" message and the "Connection closed" message? How does the system resolve names and addresses?
Guess #5: Some sort of firewall is in place that blocks access. At this point, we're getting into stuff that is VERY distro specific (like your vague question, below, about "default security settings" and how to change them). If you need help at this level, please provide the usual details about your system ...
what distro and version
what kernel ("uname -a"), and is it stock or custom-compiled
output of "iptables -nvL"... and, as I implied above, the *exact* command you enter to telnet and where you enter it from. Specifically, are you connecting to the system from itself, from another host on the LAN, or, somehow, from the Internet? (The last seems improbable, since a private IP address is involved, but I'm trying to cover all bases here.)
BTW, your Subject: line mentions rsh and rexec, but the body of your message asks nothing about them. Are you having similar connection problems with those apps?
Can the reason be something related to security. How can I change the default security settings? ON my system the security level is always showing as high and tried to change it to medium and customise But it is always at high level. How can I change this?
Thanks in advance, ravikumar
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