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********************************************
Original Email:
Dobry den,
mam takovy osklivy problem s ssh serverem na linuxu. Pocitac funguje
predevsim jako nat router (ma 2 sitovky) a mail server pro mensi firmu.
Tyto dve sluzby funguji bez problemu. Zlobi jenom ssh a to dost (pro me)
divnym zpusobem.

Na ssh se lze bez problemu prihlasit z vnitrni site.
Z internetu to nejde, a to nasledujicim zpusobem (mail.cform.cz je ten
zlobivy server):

sykora na veverka:~$ ssh -vv root na mail.cform.cz
OpenSSH_3.8p1, SSH protocols 1.5/2.0, OpenSSL 0.9.7d 17 Mar 2004
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to mail.cform.cz [88.100.254.54] port 22.
debug1: Connection established.
debug1: identity file /home/11/sykora/.ssh/identity type -1
debug1: identity file /home/11/sykora/.ssh/id_rsa type -1
debug1: identity file /home/11/sykora/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.0
debug1: match: OpenSSH_4.0 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8p1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit:
diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit:

aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,
rijndael-cbc na lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit:

aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,
rijndael-cbc na lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit:

hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 na openssh.com,hmac-sha1-96,h
mac-md5-96
debug2: kex_parse_kexinit:

hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 na openssh.com,hmac-sha1-96,h
mac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit:

diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellm
an-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit:

aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,
rijndael-cbc na lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit:

aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,
rijndael-cbc na lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit:

hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 na openssh.com,hmac-sha1-96,h
mac-md5-96
debug2: kex_parse_kexinit:

hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 na openssh.com,hmac-sha1-96,h
mac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 126/256
debug2: bits set: 523/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'mail.cform.cz' is known and matches the RSA host key.
debug1: Found key in /home/11/sykora/.ssh/known_hosts:5
debug2: bits set: 503/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/11/sykora/.ssh/identity ((nil))
debug2: key: /home/11/sykora/.ssh/id_rsa ((nil))
debug2: key: /home/11/sykora/.ssh/id_dsa ((nil))
debug1: Authentications that can continue:
publickey,gssapi-with-mic,password
debug1: Next authentication method: publickey
debug1: Trying private key: /home/11/sykora/.ssh/identity
debug1: Trying private key: /home/11/sykora/.ssh/id_rsa
debug1: Trying private key: /home/11/sykora/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug1: Next authentication method: password
root na mail.cform.cz's password:
debug2: we sent a password packet, wait for reply
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug2: channel 0: send open
debug1: Entering interactive session.
debug2: callback start
debug2: ssh_session2_setup: id 0
debug2: channel 0: request pty-req
debug2: channel 0: request shell
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768

Jak je videt z vypisu, dojde normalne ke spojeni, zadam heslo, heslo
je akceptovano serverem. Nasledne se to proste zasekne. Kdyz se na
serveru podivam, co se deje, je videt, ze byl jiz dokonce spusten bash
a je navazano spojeni. Tohle je relevantni radek z netstat:

Proto Recv-Q Send-Q
tcp        0    336 192.168.112.102:ssh
veverka.sh.cvut.cz:4226     SPOJENO

Problem je mozna v tom poli SendQ - jakoby se zablokovala odchozi
fronta tcp spojeni.
Taky by mohl byt problem nekde v DNS, ale to by zase nefungoval
ani mail server a k zaseknuti ssh by doslo mnohem driv, pravdepodobne
pri kontrole ip klienta proti hosts.allow (i kdyz pokud si vzpominam, tak
v hosts.allow jsou napsany primo ip adresy...) Zaplnenym diskem by to taky
nemelo byt, protoze z lokalni site se lze prihlasit.

Jeste bych mel zminit, ze donedavna vsechno slo ok, pak se zmenil
poskytovatel pripojeni a od te doby to zlobi. (pravdepodobne) nedoslo
tedy ke zmene konfigurace ssh serveru. Ja bohudik nejsem spravcem toho
pocitace, ale asi jsem tady v nasem mistnim kolektivu jediny, kdo ma
nejake zkusenosti s tucnakama, no ale s timhle si moc nevim rady.

Diky za odpovedi

--
Infinite diversity in infinite combinations (IDIC).