Hi everyone, i would like to know your advice, i am accessing a rhel remotely through vpn. and i was unable to access this server since few days ago. The port is open however the connection seems it dropped.

This happens also last time and i did hard reboot and it works. As much as possible i want to fix it remotely so that i don't have to go the data center.

regards,

Filezella
Status: Connecting to 10.114.2.27...
Response: fzSftp started
Command: open "root@10.114.2.27" 22
Error: Connection timed out
Error: Could not connect to server
Status: Waiting to retry...
Status: Connecting to 10.114.2.27...


===========================================================
$ping 10.114.2.27
PING 10.114.2.27 (10.114.2.27) 56(84) bytes of data.
64 bytes from 10.114.2.27: icmp_seq=0 ttl=64 time=0.169 ms
64 bytes from 10.114.2.27: icmp_seq=1 ttl=64 time=0.148 ms
64 bytes from 10.114.2.27: icmp_seq=2 ttl=64 time=0.145 ms

--- 10.114.2.27 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.145/0.154/0.169/0.010 ms, pipe 2
===========================================================

$telnet 10.114.2.27 22
Trying 10.114.2.27...
Connected to 10.114.2.27.
Escape character is '^]'.
^]
telnet> quit
Connection closed.

$nmap 10.114.2.27
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2011-04-23 13:49 PHT
Interesting ports on 10.114.2.27:
(The 1656 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
22/tcp open ssh
111/tcp open rpcbind
113/tcp open auth
723/tcp open omfs

This information shows us pretty clearly that the service is not responding, but unfortunately provides no clues as to why the SSH daemon is not functioning properly.

Can you post any log messages that relate to SSH? What SSH server specifically is being used? Have you made any modifications to the SSH configuration, and if so, what? With more information about the system itself, we can start troubleshooting the actual cause of the problem, rather than the symptom.

Have you looked at the /var/log/secure output on your server?

Try using "ssh -vv" to provide more debug information. Use ssh instead of filezilla to test the connection.

Does the server use a super daemon (like xinetd) to accept ssh connections? I'm wondering why telnet was able to create a connection but ssh doesn't. For example, is the sshd daemon running?

The telnet(1) and nmap(1) output show that a tcp handshake to port 22 is succeeding. But there is no sshd banner in the telnet(1) output - odd.

As mentioned, you need to review /var/log/secure on the server itself for clues.

Thanks Guys for the response, the schedule for activity is by next week to the data center i cannot check the server itself. for now see the verbos mode.


$ssh -vv 10.114.2.27
OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 10.114.2.27 [10.114.2.27] port 22.
debug1: Connection established.
debug1: identity file /app1/am/.ssh/identity type -1
debug1: identity file /app1/am/.ssh/id_rsa type -1
debug1: identity file /app1/am/.ssh/id_dsa type -1

==end==

Is there more to the debug file? Do you use pubkey authentication?
for a comparison:
Either something else is using port 22; but the "debug2: ssh_connect: needpriv 0" line indicates that sshd is running on the target; or you don't have a keypair generated. I don't see how you don't have any more debug information.

Generate a keypair for your client and try again. See what the debug information says then.

Thank you for all the response. the main issue is the disk device is not responding which causes the system to hang.