linux - ssh: connection refused on port 22 -


i have installed openssh-sever. started ssh-server using following command :

:~$ sudo service ssh start ssh start/running, process 20013

with following command can see port 22 open :

:~$ sudo nmap localhost -p 1-65535 starting nmap 6.40 ( http://nmap.org ) @ 2015-04-22 23:46 edt nmap scan report localhost (127.0.0.1) host (0.000013s latency). not shown: 65533 closed ports port    state service 22/tcp  open  ssh 631/tcp open  ipp  nmap done: 1 ip address (1 host up) scanned in 7.24 seconds

furthermore, check if port listening used following command results :

:~$ sudo netstat -plunt active internet connections (only servers) proto recv-q send-q local address           foreign address         state       pid/program name tcp        0      0 127.0.1.1:53            0.0.0.0:*               listen      1061/dnsmasq     tcp        0      0 0.0.0.0:22              0.0.0.0:*               listen      20013/sshd       tcp        0      0 127.0.0.1:631           0.0.0.0:*               listen      2009/cupsd       tcp6       0      0 :::22                   :::*                    listen      20013/sshd       tcp6       0      0 ::1:631                 :::*                    listen      2009/cupsd       udp        0      0 0.0.0.0:42198           0.0.0.0:*

but when try connect port same machine following message :

:~$ ssh -vvv -p 22 address openssh_6.6.1, openssl 1.0.1f 6 jan 2014 debug1: reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: applying options * debug2: ssh_connect: needpriv 0 debug1: connecting address [198.105.xxx.xxx] port 22. debug1: connect address 198.105.xxx.xxx port 22: connection timed out

when try ssh different computer on different network following message(xx.xxx.xxx.xxx external/public ip of router) :

:~ssh bhuwan@xx.xxx.xxx.xxx ssh: connect host xx.xxx.xxx.xxx port 22: connection refused

whereas, when try ssh different computer on same network able connect. have port forwarding enabled on router on port 22 local ip of computer. literally started using ubuntu 2 days ago , started working on ssh same day. i'm not expert on of , simplified explanation or guidance appreciated. :)

below sshd_config file:

# package generated configuration file # see sshd_config(5) manpage details  # ports, ips , protocols listen port 22 # use these options restrict interfaces/protocols sshd bind #listenaddress :: #listenaddress 0.0.0.0 protocol 2 # hostkeys protocol version 2 hostkey /etc/ssh/ssh_host_rsa_key hostkey /etc/ssh/ssh_host_dsa_key hostkey /etc/ssh/ssh_host_ecdsa_key hostkey /etc/ssh/ssh_host_ed25519_key #privilege separation turned on security useprivilegeseparation yes  # lifetime , size of ephemeral version 1 server key keyregenerationinterval 3600 serverkeybits 1024  # logging syslogfacility auth loglevel info  # authentication: logingracetime 120 permitrootlogin without-password strictmodes yes  rsaauthentication yes pubkeyauthentication yes #authorizedkeysfile %h/.ssh/authorized_keys  # don't read user's ~/.rhosts , ~/.shosts files ignorerhosts yes # work need host keys in /etc/ssh_known_hosts rhostsrsaauthentication no # similar protocol version 2 hostbasedauthentication no # uncomment if don't trust ~/.ssh/known_hosts rhostsrsaauthentication #ignoreuserknownhosts yes  # enable empty passwords, change yes (not recommended) permitemptypasswords no  # change yes enable challenge-response passwords (beware issues # pam modules , threads) challengeresponseauthentication no  # change no disable tunnelled clear text passwords #passwordauthentication yes  # kerberos options #kerberosauthentication no #kerberosgetafstoken no #kerberosorlocalpasswd yes #kerberosticketcleanup yes  # gssapi options gssapiauthentication yes #gssapicleanupcredentials yes   allowtcpforwarding yes x11forwarding yes x11displayoffset 10 printmotd no printlastlog yes tcpkeepalive yes #uselogin no  #maxstartups 10:30:60 #banner /etc/issue.net  # allow client pass locale environment variables acceptenv lang lc_*  subsystem sftp /usr/lib/openssh/sftp-server  # set 'yes' enable pam authentication, account processing, # , session processing. if enabled, pam authentication # allowed through challengeresponseauthentication , # passwordauthentication.  depending on pam configuration, # pam authentication via challengeresponseauthentication may bypass # setting of "permitrootlogin without-password". # if want pam account , session checks run without # pam authentication, enable set passwordauthentication # , challengeresponseauthentication 'no'. usepam yes

and ssh_config file follows:

# ssh client system-wide configuration file.  see # ssh_config(5) more information.  file provides defaults # users, , values can changed in per-user configuration files # or on command line.  # configuration data parsed follows: #  1. command line options #  2. user-specific file #  3. system-wide file # configuration value changed first time set. # thus, host-specific definitions should @ beginning of # configuration file, , defaults @ end.  # site-wide defaults commonly used options.  comprehensive # list of available options, meanings , defaults, please see # ssh_config(5) man page.  host *  serveraliveinterval 300 #   forwardagent no #   forwardx11 no #   forwardx11trusted yes #   rhostsrsaauthentication no #   rsaauthentication yes #   passwordauthentication yes #   hostbasedauthentication no #   gssapiauthentication no #   gssapidelegatecredentials no #   gssapikeyexchange no #   gssapitrustdns no #   batchmode no #   checkhostip yes #   addressfamily #   connecttimeout 0 #   stricthostkeychecking ask #   identityfile ~/.ssh/identity #   identityfile ~/.ssh/id_rsa #   identityfile ~/.ssh/id_dsa #   port 22 #   protocol 2,1 #   cipher 3des #   ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc #   macs hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160 #   escapechar ~ #   tunnel no #   tunneldevice any:any #   permitlocalcommand no #   visualhostkey no #   proxycommand ssh -q -w %h:%p gateway.example.com #   rekeylimit 1g 1h     sendenv lang lc_*     hashknownhosts yes     gssapiauthentication yes     gssapidelegatecredentials no

after long haul found out problem modem isp provided. above configuration should work fine if modem/router has port forwarding not blocked isp. modem/router isp provided, after tried port forwarding, port 22 not open can checked here: http://www.canyouseeme.org/.


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