SSH修改端口报错 error: Bind to port xxx on 0.0.0.0 failed: Permission denied.解决方法

Question

CentOS 6.3 Minimal Configuration. Installed SSH Server, port 22. All works correctly. I change port 22 on 777 and restart sshd and see in logs:

Jul 26 01:01:07 myserver sshd[1590]: error: Bind to port 777 on 0.0.0.0 failed: Permission denied.
Jul 26 01:01:07 myserver sshd[1590]: error: Bind to port 777 on :: failed: Permission denied.
Jul 26 01:01:07 myserver sshd[1590]: fatal: Cannot bind any address.

/etc/sysconfig/iptables contains:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 777 -j ACCEPT

netstat -tulpn | grep :22 and netstat -tulpn | grep :777 return nothing

score 0 · Accepted Answer · 2012-07-26 15:45:18Z

0

Port 777 is dedicated for Multiling HTTP and even though not in use you can't bind to it. If you try for example to bind to port 8777 it will work just fine.

answered Jul 26 '12 at 15:45

Florin Stingaciu

5,68221739

Thank you, I don't know it. This port succesfully work in Ubuntu since past year. – indapublic Jul 26 '12 at 15:53
The problem is that SELinux won't allow ssh to run on another port. On CentOS with SELinux enabled it won't run on port 8777 either. – Christian Ulbrich Apr 24 '18 at 21:10

add a comment

7

Centos uses SELinux by default and I don't think Ubuntu does (or least I've not seen it). Have a look for SElinux permission errors in your logs too.

answered Jul 30 '12 at 0:37

Net Wolf

544417

add a comment

1

SELinux does not allow sshd to be run on another port on a default install of CentOS 6.3. Follow -> https://blog.tinned-software.net/change-ssh-port-in-centos-with-selinux/ :

dig a hole into your firewall (you already did that)
add a rule for SELinux to allow sshd to be run on port 777: sudo semanage port -a -t ssh_port_t -p tcp 777

score 7 · Answer 2 · 2012-07-30 00:37:04Z

7

Centos uses SELinux by default and I don't think Ubuntu does (or least I've not seen it). Have a look for SElinux permission errors in your logs too.

answered Jul 30 '12 at 0:37

Net Wolf

544417

add a comment

1

SELinux does not allow sshd to be run on another port on a default install of CentOS 6.3. Follow -> https://blog.tinned-software.net/change-ssh-port-in-centos-with-selinux/ :

dig a hole into your firewall (you already did that)
add a rule for SELinux to allow sshd to be run on port 777: sudo semanage port -a -t ssh_port_t -p tcp 777

score 1 · Answer 3

SELinux does not allow sshd to be run on another port on a default install of CentOS 6.3. Follow -> https://blog.tinned-software.net/change-ssh-port-in-centos-with-selinux/ :

dig a hole into your firewall (you already did that)
add a rule for SELinux to allow sshd to be run on port 777: sudo semanage port -a -t ssh_port_t -p tcp 777

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HQY

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SSH修改端口报错 error: Bind to port xxx on 0.0.0.0 failed: Permission denied.解决方法

hqy 发表于2019-05-13 10:07:50 浏览5765 评论0

SSH修改端口报错 error: Bind to port xxx on 0.0.0.0 failed: Permission denied.解决方法

3 Answers

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