How about the tail of /var/log/messages, any
interesting info?
tail var/log/messages: Jun 8 04:02:31 localhost syslogd 1.4.1: restart. Jun 9 04:02:37 localhost kernel: (scsi0:A:1:0): Locking max tag count at 40 Jun 9 16:15:03 localhost kernel: eth0: link up, 100Mbps, full-duplex, lpa 0x45E1 Jun 9 17:25:23 localhost kernel: eth0: Bus master arbitration failure, status ffff.
google for it i never had such a message is your connection always ok? hardware, driver, nic, wire, switch, ...
# cat /etc/modules.conf # lsmod # modinfo your_nic_module
ping your-server-ip (eg. with temporary unplugged wire)
64 bytes from www2.vip.lng.yahoo.com (217.12.3.11): icmp_seq=44 ttl=246 time=96.2 ms
64 bytes from www2.vip.lng.yahoo.com (217.12.3.11): icmp_seq=45 ttl=246 time=97.7 ms
From 192.168.101.10 icmp_seq=117 Destination Host Unreachable
64 bytes from www2.vip.lng.yahoo.com (217.12.3.11): icmp_seq=129 ttl=246 time=2097 ms
or check from time to time with # mii-tool eth0 eth0: negotiated 100baseTx-FD, link ok
# ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 8
Transceiver: internal
Auto-negotiation: on
Current message level: 0x00000001 (1)
Link detected: yesJun 9 17:25:23 localhost last message repeated 2 times Jun 12 11:45:01 localhost kernel: ip_tables: (C) 2000-2002 Netfilter core team Jun 12 11:45:01 localhost iptables: succeeded
telnet your_server_ip 22
$ telnet localhost 22 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. SSH-1.99-OpenSSH_3.4p1 ^] [ctl][altgr][9] telnet> quit Connection closed.
ssh-verbose-mode
$ ssh -vvv your_server_ip (eg. wrong password)
...
Permission denied, please try again.
debug3: packet_send2: adding 64 (len 50 padlen 14 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug1: authentications that can continue: publickey,password,keyboard-interactive
Permission denied, please try again.
debug3: packet_send2: adding 64 (len 50 padlen 14 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug1: authentications that can continue: publickey,password,keyboard-interactive
debug2: we did not send a packet, disable method
debug1: no more auth methods to try
Permission denied (publickey,password,keyboard-interactive).
debug1: Calling cleanup 0x80674b0(0x0)
$ ssh -vvv your_server_ip (eg. correct login) ... debug3: tty_make_modes: 71 0 debug3: tty_make_modes: 72 1 debug3: tty_make_modes: 73 0 debug3: tty_make_modes: 74 0 debug3: tty_make_modes: 75 0 debug3: tty_make_modes: 90 1 debug3: tty_make_modes: 91 1 debug3: tty_make_modes: 92 0 debug3: tty_make_modes: 93 0 debug2: x11_get_proto /usr/X11R6/bin/xauth list :0 2>/dev/null debug1: Requesting X11 forwarding with authentication spoofing. debug1: channel request 0: x11-req debug1: channel request 0: shell debug1: fd 3 setting TCP_NODELAY debug2: callback done debug1: channel 0: open confirm rwindow 0 rmax 32768 debug2: channel 0: rcvd adjust 131072
# iptables -A INPUT -p tcp -m multiport --sport 22 -j DROP
$ ssh -vvv localhost (eg. closed input-sourceport 22)
OpenSSH_3.4p1, SSH protocols 1.5/2.0, OpenSSL 0x0090602f
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Rhosts Authentication disabled, originating port will not be trusted.
debug1: ssh_connect: needpriv 0
debug1: Connecting to localhost [127.0.0.1] port 22.
you can wait here - and wait - and wait - and wait - and wait - ...
good luck
-- shrek-m
