But the result shows that the network shall be perfect:
[~] [18:28:47]|-->: tcptraceroute 126.96.36.199 22
Selected device eth1, address 188.8.131.52, port 50066 for outgoing packets
Tracing the path to 184.108.40.206 on TCP port 22 (ssh), 30 hops max
1 vl1.c6500th.keyweb.de (220.127.116.11) 0.469 ms 0.322 ms 0.248 ms
2 te1-1.c6500c1.keyweb.de (18.104.22.168) 0.246 ms 0.274 ms 0.230 ms
3 vl4006.c6500nw.keyweb.de (22.214.171.124) 0.709 ms 0.397 ms 0.306 ms
4 ns.km37111.keymachine.de (126.96.36.199) [open] 0.192 ms 0.243 ms 0.188 ms
You have new mail in /var/mail/root
[~] [18:28:57]|-->: ssh 188.8.131.52
ssh_exchange_identification: Connection closed by remote host
I try strace, but as network-admin I'm not quite familiar with this. When I start the ssh deamon with strace (strace /etc/init.d/sshd start), it shows only the systemcalls while starting, but then strace exits because the startup is finished. When I put strace on one of the PIDs of SSH it ends after some seconds, because the childs start on a new connection as it seems.
>Try tcptraceroute . Works as regular traceroute (adding the TCP port you want to probe as the last parameter), but it uses TCP SYN/ACK instead >ICMP, so you can check if any router on the way is blocking the traffic.
>> as it seems, there is a problem with some IPs.
>> Problem Description:
>> Debian x64 Lenny 5.04
>> - base install, without any additional packages, only IPs configured
>> - with some special IPs, SSH is not working on Port 22 -> "server unexpectedly closed the network connection"
>> - when we change the SSH port, ssh works
>> - when we change the IP, ssh works on port 22
>> - when we configure this suspicious IP on a completly other server,
>> the same problem occures
>> - we have checked for network problems, but all ACLs are correct, not
>> one switchport or ACL on the core switches is configured for this IP
>> this are the two IPs, where SSH did not work on port 22
>> we have no ideas... we hope you have?
>Diego Rodríguez González
>Ferrocarriles de Via Estrecha
>Dpto. Telecomunicaciones y Sistemas Informáticos
>email@example.com (+34)985981778 ext. 99004 / (+34)660574762
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