See if the PermitRootLogin option is set to No in /etc/ssh/sshd_config
Change to Yes to allow logins for root from a remote network.
Also restart SSH service once done. service sshd restart
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ssh to linux from remote not working
hi
i have allowed ssh to one of my linux server, locally and from remote. Locally it is working fine. But when i do from the remote location , it ask for username and password, it gives a message
access denied. I am using root user and password
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Answers
I recommend, if root if disabled for remote login, that you do not change that. Setup "sudo" instead and use a regular user for remote access, then switch to root via sudo.
If you are running an SSH server, someone will eventually scan you and try a brute force attack. root is one of the most common accounts used in the attack.
if IPtables would of block 22 then he would not see the prompt for username and password at all
since he is seeing the username and password prompt then i belived its not iptables issue
something on the server is blocking outside access..
in sshd_config file, did you check properly, there is not any restriction ???
sshd_config file
# This sshd was compiled with PATH=/usr/local/bin:/bin:/
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options change a
# default value.
Port 22
#Protocol 2,1
Protocol 2
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 768
# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
SyslogFacility AUTHPRIV
#LogLevel INFO
# Authentication:
#LoginGraceTime 2m
PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#RSAAuthentication yes
#PubkeyAuthentication yes
#AuthorizedKeysFile ..ssh/authorized_keys
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
PasswordAuthentication yes
# Change to no to disable s/key passwords
#ChallengeResponseAuthenti
ChallengeResponseAuthentic
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
GSSAPIAuthentication yes
#GSSAPICleanupCredentials yes
GSSAPICleanupCredentials yes
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentic
# Depending on your PAM configuration, this may bypass the setting of
# PasswordAuthentication, PermitEmptyPasswords, and
# "PermitRootLogin without-password". If you just want the PAM account and
# session checks to run without PAM authentication, then enable this but set
# ChallengeResponseAuthentic
#UsePAM no
UsePAM yes
# Accept locale-related environment variables
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
AcceptEnv LC_IDENTIFICATION LC_ALL
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PrintMotd yes
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
#UsePrivilegeSeparation yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#ShowPatchLevel no
#UseDNS yes
#PidFile /var/run/sshd.pid
#MaxStartups 10
#PermitTunnel no
# no default banner path
#Banner /some/path
# override default of no subsystems
Subsystem sftp /usr/libexec/openssh/sftp-
[root@UOBCLSRV ~]#
hi
attached the secure.log file
ct 27 15:40:14 UOBCLSRV sshd[4686]: pam_unix(sshd:session): session closed for user root
Oct 28 06:35:27 UOBCLSRV sshd[31413]: Did not receive identification string from 124.162.53.197
Oct 28 08:30:08 UOBCLSRV sshd[9702]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.26.71 user=root
Oct 28 08:30:10 UOBCLSRV sshd[9702]: Failed password for root from 192.168.26.71 port 3072 ssh2
Oct 28 08:30:21 UOBCLSRV sshd[9702]: Accepted password for root from 192.168.26.71 port 3072 ssh2
Oct 28 08:30:21 UOBCLSRV sshd[9702]: pam_unix(sshd:session): session opened for user root by (uid=0)
Oct 28 08:30:21 UOBCLSRV sshd[9702]: subsystem request for sftp
Oct 28 08:36:40 UOBCLSRV sshd[10592]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.26.71 user=root
Oct 28 08:36:43 UOBCLSRV sshd[10592]: Failed password for root from 192.168.26.71 port 3131 ssh2
Oct 28 08:36:45 UOBCLSRV sshd[10592]: Failed password for root from 192.168.26.71 port 3131 ssh2
Oct 28 08:36:48 UOBCLSRV sshd[10593]: Received disconnect from 192.168.26.71: 13: Unable to authenticate
Oct 28 08:36:48 UOBCLSRV sshd[10592]: PAM 1 more authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.26.71 user=root
Oct 28 08:41:08 UOBCLSRV sshd[9702]: pam_unix(sshd:session): session closed for user root
Oct 28 08:43:36 UOBCLSRV sshd[11085]: Accepted password for root from 192.168.26.71 port 3189 ssh2
Oct 28 08:43:36 UOBCLSRV sshd[11085]: pam_unix(sshd:session): session opened for user root by (uid=0)
Oct 28 08:55:42 UOBCLSRV sshd[12686]: Accepted password for root from 192.168.26.101 port 1493 ssh2
Oct 28 08:55:42 UOBCLSRV sshd[12686]: pam_unix(sshd:session): session opened for user root by (uid=0)
Oct 28 09:24:28 UOBCLSRV sshd[12686]: pam_unix(sshd:session): session closed for user root
Oct 28 20:38:06 UOBCLSRV sshd[15641]: Did not receive identification string from 220.227.238.50
Oct 28 20:49:27 UOBCLSRV sshd[16580]: Did not receive identification string from 128.97.70.201
Oct 29 08:08:09 UOBCLSRV sshd[17059]: Did not receive identification string from 59.52.255.63
Oct 29 12:05:46 UOBCLSRV sshd[8570]: Did not receive identification string from 220.181.21.250
Oct 29 12:17:18 UOBCLSRV sshd[11085]: pam_unix(sshd:session): session closed for user root
Oct 29 12:27:14 UOBCLSRV sshd[10525]: Accepted password for root from 192.168.26.71 port 1139 ssh2
Oct 29 12:27:14 UOBCLSRV sshd[10525]: pam_unix(sshd:session): session opened for user root by (uid=0)
Oct 29 15:32:45 UOBCLSRV sshd[28699]: Did not receive identification string from 88.87.212.214
Oct 29 15:36:59 UOBCLSRV sshd[29180]: Did not receive identification string from 88.87.212.214
Oct 29 16:50:46 UOBCLSRV sshd[3877]: Did not receive identification string from 61.136.60.175
Oct 29 17:19:08 UOBCLSRV sshd[6270]: Did not receive identification string from 61.129.60.23
Oct 29 20:16:59 UOBCLSRV sshd[23548]: Did not receive identification string from 213.184.238.38
Oct 30 11:45:02 UOBCLSRV sshd[15835]: Did not receive identification string from 202.155.229.105
Oct 30 16:45:08 UOBCLSRV sshd[12176]: Did not receive identification string from 208.77.223.10
Oct 30 20:06:30 UOBCLSRV sshd[697]: Did not receive identification string from 201.116.35.190
Oct 30 22:45:16 UOBCLSRV sshd[20811]: Did not receive identification string from 201.116.35.190
Oct 31 13:48:34 UOBCLSRV sshd[14717]: Did not receive identification string from 201.116.35.190
Oct 31 19:17:51 UOBCLSRV sshd[13499]: Did not receive identification string from 210.110.181.56
Oct 31 22:17:36 UOBCLSRV sshd[30642]: Did not receive identification string from 121.15.167.235
Oct 31 22:22:03 UOBCLSRV sshd[31111]: Did not receive identification string from 121.15.167.235
Oct 28 08:55:42 UOBCLSRV sshd[12686]: Accepted password for root from 192.168.26.101 port 1493 ssh2
Oct 28 08:55:42 UOBCLSRV sshd[12686]: pam_unix(sshd:session): session opened for user root by (uid=0)
Oct 28 09:24:28 UOBCLSRV sshd[12686]: pam_unix(sshd:session): session closed for user root
not seeing the problem..?
Ah.. I see.
So when you say remote logins don't work, you mean it doesn't work from anywhere except 192.168.26.0? Does it work from any other ranges? Or only local LAN?
It can't be a firewall/wrapper issue as you are able to connect to the port and get a password prompt, so it must be something with SSH.
What are you using to connect to the host on the local LAN, what are you using to connect from outside the LAN? You can get that "did not receive identification string" from a version mismatch between SSH client and server.
First thing to do would be to make sure there is no difference whatsoever between where you connect from remotely and local LAN besides the source IP address. Also look to see if there is an AllowUsers or AllowHosts line in your sshd_config.
HI good morning
Sorry i was not available to see this question
anyway
look at this log
Did not receive identification string from 201.116.35.190
Oct 31 13:48:34 UOBCLSRV sshd[14717]: Did not receive identification string from 201.116.35.190
Oct 31 19:17:51 UOBCLSRV sshd[13499]: Did not receive identification string from 210.110.181.56
Oct 31 22:17:36 UOBCLSRV sshd[30642]: Did not receive identification string from 121.15.167.235
Oct 31 22:22:03 UOBCLSRV sshd[31111]: Did not receive identification string from 121.15.167.235
so you are trying from 201.116.35.190 ip to your remote server
is that right ??
Sounds like a routing/firewall issue if you get a network timeout error. Generally when I have connectivity problems the first thing I take out is the firewall so it can't be a filtering problem.. that way one can atleast work out if ít's a routing or NAT issue or whatever without it just being a firewall in the way.
Drop the firewalling for that host and see what happens.
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by: jemmastaPosted on 2009-10-28 at 08:34:16ID: 25684400
It's a possibility that you haven't given access to root account remotely.
Also it's not very wise to give root access from outside in any case. Try to create a new account and try to access with from network. You can still have root privileges through su or sudo even with other account.