To view the list of user-defined applications on a Juniper Networks router/firewall running the JunOS operating system from a command-line interface (CLI), you can enter cli mode by issuing the command cli after logging in and then issue the command show configuration applications.

root@Bellatrix> show configuration applications
application POP3 {
    protocol tcp;
    destination-port 110;
}
application POP3S {
    protocol tcp;
    destination-port 995;
}
application Rising_World_TCP {
    protocol tcp;
    destination-port 4254-4259;
}
application Rising_World_UDP {
    protocol udp;
    destination-port 4254-4259;
}

root@Bellatrix>

To view the list of predefined junos- applications from the CLI, you can enter cli mode by issuing the command cli after logging in and then issue the command show configuration groups junos-defaults applications.

[ More Info ]

[/security/firewalls/SRX] permanent link

To determine what process is listening on a particular TCP port on a Linux system, you can use the ss command. On a CentOS Linux system, the command can be found in the /sbin/ss directory. The utility is part of the iproute, or iproute2 package.

# which ss
/sbin/ss
# rpm -qf /sbin/ss
iproute-3.10.0-21.el7.x86_64
#

To see help information on the utility, you can use the command ss --help.

# ss --help
Usage: ss [ OPTIONS ]
       ss [ OPTIONS ] [ FILTER ]
   -h, --help           this message
   -V, --version        output version information
   -n, --numeric        don't resolve service names
   -r, --resolve       resolve host names
   -a, --all            display all sockets
   -l, --listening      display listening sockets
   -o, --options       show timer information
   -e, --extended      show detailed socket information
   -m, --memory        show socket memory usage
   -p, --processes      show process using socket
   -i, --info           show internal TCP information
   -s, --summary        show socket usage summary
   -b, --bpf           show bpf filter socket information

   -4, --ipv4          display only IP version 4 sockets
   -6, --ipv6          display only IP version 6 sockets
   -0, --packet display PACKET sockets
   -t, --tcp            display only TCP sockets
   -u, --udp            display only UDP sockets
   -d, --dccp           display only DCCP sockets
   -w, --raw            display only RAW sockets
   -x, --unix           display only Unix domain sockets
   -f, --family=FAMILY display sockets of type FAMILY

   -A, --query=QUERY, --socket=QUERY
       QUERY := {all|inet|tcp|udp|raw|unix|packet|netlink}[,QUERY]

   -D, --diag=FILE     Dump raw information about TCP sockets to FILE
   -F, --filter=FILE   read filter information from FILE
       FILTER := [ state TCP-STATE ] [ EXPRESSION ]
#

Or you can consult the manual page for ss using the command man ss.

[ More Info ]

[/os/unix/linux/network] permanent link

An .htpasswd file can be used to control access to specific directories that visitors to a web server can access when the web server is an Apache web server. Entries in the file can be added, modified, or deleted using the htpasswd utility, which may be in the /bin directory on a Linux sysem. To update a password for a user listed in an .htpasswd file, a command in the form htpasswd htpasswdFileLocation user where htpasswdFileLocation is the location and name for the .htpassword file on the system and user is a specific user listed in that file. The htpasswd utility will prompt for a new password and then prompt you to retype it to ensure there has not been a typo when the new password was provided. E.g.:

# htpasswd /home/jdoe/music/.htpasswd mary
New password:
Re-type new password:
Updating password for user mary
#

If you wish to delete an entry for a user in the .htpasswd file, you can use a command in the form htpasswd -D htpasswdFileLocation user. The -D indicates the entry for the user should be deleted. The response will indicate the password for the user was deleted, which is true, but that indicates the entire entry for that user was removd from the file. E.g.:

# htpasswd -D /home/jdoe/music/.htpasswd manny
Deleting password for user manny
#

Related

1. Apache AllowOverride AuthConfig Directive
   Date: May 13, 2008

[/network/web/server/apache] permanent link

Microsoft provides Secure Shell (SSH) server software with Windows 11 that you can use to listen for connections from remote SSH clients, but the server service is not installed by default. To install the Microsoft-provided SSH server software on a Windows 11 system, take the following steps:

1. Type optional features in the Windows Search field at the bottom of the screen and hit Enter, then click on "Open" when it is found.
2. Click on the View features button.
3. Scroll down the list of optional features until you see Open SSH Server and then click on the check box for it and click on the Next button.
4. Click on the Add button to add the OpenSSH Server capability to the system.
5. When the Optional features window shows that the OpenSSH Server software has been added, you can close the window. If you scroll down the list of added features before closing the window, you should see OpenSSH Server below OpenSSH Client.

After installing the software, you will need to start the OpenSSH server service.

[ More Info ]

[/os/windows/network/ssh/OpenSSH] permanent link