Error Bind Failed Permission Denied
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Failed To Bind Socket Permission Denied
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Ntpdate Bind Fails Permission Denied
Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Socket programing Permission denied up vote 1 down vote favorite 1 Following code is TCP server program just send back “HELLO!!” to client. When socket permission denied linux I run server with port 80, bind() is returned Permission denied. Port 12345 is OK. How can I use port 80 for this server program? #include
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Redis Opening Socket: Bind: Permission Denied
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2014-02-12 by Gerhard share tweet share share share share share share share share e-mail rss feed flattr donate donate Since version 4 of CentOS, SELinux is providing an additional layer of security to the Linux distribution. CentOS describes it like this: https://blog.tinned-software.net/change-ssh-port-in-centos-with-selinux/ "Security-Enhanced Linux (SELinux) is a mandatory access control (MAC) security mechanism implemented in the kernel." In other words, it controls with rules what a user or process is allowed to do. In my experience, keeping SSH on the default port 22 is a bad idea, as you will notice a lot of login attempts shortly after your server goes online. One of the actions (of course not the only one) to secure the server is to permission denied just change this port. With SELinux in combination with sshd, changing the port, or even listening on 2 ports, is not as easy as just changing the sshd configuration file. First we will need to configure sshd to listen on the new port. As precaution, I'd suggest changing the port in a two step process: first adding the new port to the sshd configuration as a second listening port and in the second step, after verifying bind failed permission that the new port works, removing the old/standard port from the configuration or blocking it via the firewall. For this article lets assume the new port number will be 1234. This is just a number I made up. You need to check first that the port number you choose will not be used from any other service you will run on your server. For example, choosing port 80 would be possible but not wise if you want to run a web-server as well. So it's best to choose a port that is not commonly used for anything else. Make sure the following lines are in the sshd configuration and none of them is commented out with a leading "#". In CentOS the ssh server configuration can be found at /etc/ssh/sshd_config. Port 22 Port 1234 From sshd's perspective that should be enough to make it listen on both ports. If you have configured a firewall on your server, make sure the firewall is not blocking the new port. Now we can restart sshd with the following command: $ /etc/init.d/sshd restart After this you will see that the restart was successful. With the command "lsof -i -P -n" you can check all listening ports. You should see that sshd is not listening on the new port 1234 but still on 22. A quick look into the logfile will re