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telnet到RedHat Linux失败解决办法

时间:2017-06-12  来源:未知  作者:admin666

telnet到RedHat Linux失败原因:

1.telnet包未安装,检查telnet包是否安装: 

[root@vm-rhel root]# rpm -qa telnet
 telnet-0.17-25

 表示已安装

 2.telnet包已安装,telnet-server未安装,检查telnet-server包是否安装:

[root@vm-rhel root]# rpm -qa telnet-server
 telnet-server-0.17-25

 表示已安装

 3.telnet配置文件问题:

[root@vm-rhel root]# cat /etc/xinetd.d/telnet
# default: on
# description: The telnet server serves telnet sessions; it uses \
#    unencrypted username/password pairs for authentication.
service telnet
{
    flags        = REUSE
    socket_type    = stream       
    wait        = no
    user        = root
    server        = /usr/sbin/in.telnetd
    log_on_failure    += USERID
    disable        = yes
}

将disable对应的值修改为no或者注释该行并重启xinetd守护进程:service xinetd restart。

4.Linux防火墙原因,查看防火墙状态:

[root@vm-rhel root]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
target prot opt source destination
RH-Lokkit-0-50-INPUT all -- anywhere anywhere

Chain FORWARD (policy ACCEPT)
target prot opt source destination
RH-Lokkit-0-50-INPUT all -- anywhere anywhere

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

Chain RH-Lokkit-0-50-INPUT (2 references)
target prot opt source destination
ACCEPT udp -- 192.168.1.1 anywhere udp spt:domain dpts:1025:65535
ACCEPT tcp -- anywhere anywhere tcp dpt:smtp flags:SYN,RST,ACK/SYN
ACCEPT tcp -- anywhere anywhere tcp dpt:http flags:SYN,RST,ACK/SYN
ACCEPT tcp -- anywhere anywhere tcp dpt:ftp flags:SYN,RST,ACK/SYN
ACCEPT tcp -- anywhere anywhere tcp dpt:ssh flags:SYN,RST,ACK/SYN
ACCEPT tcp -- anywhere anywhere tcp dpt:telnet flags:SYN,RST,ACK/SYN
ACCEPT udp -- anywhere anywhere udp spts:bootps:bootpc dpts:bootps:bootpc
ACCEPT udp -- anywhere anywhere udp spts:bootps:bootpc dpts:bootps:bootpc
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
REJECT tcp -- anywhere anywhere tcp dpts:0:1023 flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable
REJECT tcp -- anywhere anywhere tcp dpt:nfs flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable
REJECT udp -- anywhere anywhere udp dpts:0:1023 reject-with icmp-port-unreachable
REJECT udp -- anywhere anywhere udp dpt:nfs reject-with icmp-port-unreachable
REJECT tcp -- anywhere anywhere tcp dpts:x11:6009 flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable
REJECT tcp -- anywhere anywhere tcp dpt:xfs flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable

表示未关闭,如果防火墙已关闭,则不需要在/etc/sysconfig/iptables配置文件中添加:-A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 23 --syn -j ACCEPT。

关闭防火墙:service iptables stop (重启后失效:防火墙开机自动启动)

启动防火墙:service iptables start

重启防火墙:service iptables restart

禁止防火墙开机自动启动:chkconfig iptables off

5.默认情况下Linux不允许root用户以telnet方式登录Linux主机,若要允许root用户登录可采用以下3中方法:

(1)修改/etc/pam.d/login配置文件

RedHat Linux对于远程登录的限制体现在/etc/pam.d/login文件中,把限制内容注释即可。

[root@vm-rhel root]# cat /etc/pam.d/login
#%PAM-1.0
auth      required    pam_securetty.so
auth      required    pam_stack.so service=system-auth
#auth      required    pam_nologin.so
account    required    pam_stack.so service=system-auth
password  required    pam_stack.so service=system-auth
session    required    pam_stack.so service=system-auth
session    optional    pam_console.so

(2)移除/etc/securetty文件夹

验证规则设置在/etc/securetty文件中,该文件定义了root用户只能在tty1-tty6的终端上记录,删除该文件或将其改名即可避开验证规则从而实现root用户以telnet方式远程登录Linux主机。

[root@vm-rhel root]# mv /etc/securetty /etc/securetty.bak

(3)先用普通用户登录,然后切换到root用户

[bboss@vm-rhel bboss]$ su root
Password:
[root@vm-rhel bboss]#

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