test open ports

Reprinted from: https://linux.cn/article-4243-1.htmlIf you want to provide services on the server, Enterprise Linux distributions such as CentOS or Rhel contain built-in powerful firewalls, which are strictly the default firewall rules. Therefore, if you install any custom services (such as Web servers, NFS, and Samba), then their traffic is likely to be blocked by firewall rules. So you need to open the necessary

Execute shell commands in the program to automatically obtain all the online IP addresses and open ports in the LAN (Linux), shelllinuxPreface The question is a bit long. It is actually the following: first, let the Shell command be executed in the program, and then pass the execution result to the variable, so that subsequent transactions can be processed, the second is to use the nmap command to obtain al

One, see which ports are open NETSTAT-ANPSecond, turn off the port number: iptables-a input-p TCP--drop port number-j dropIptables-a output-p TCP--dport port number-j DROPThird, start the slogan: iptables-a input-ptcp--dport port number-j ACCEPTFour, the following is the use of the Linux Open Port command.Nc-lp (Open

In many projects, NetScaler is generally placed in the DMZ, and NS is isolated from the backend infrastructure network, and the general bank and securities customers only open ports for VDI access, and here's the Citrix NetScaler ports that I previously organized in a project ...Firewall Open port:650) this.width=650;

caveat.Once connected to Jmxregistry running on the port specified byCom.sun.management.jmxremote.portproperty, the actual objects are served by Rmiserver which was running on different port. Unfortunately this port is chosen randomly by default instance the JMX Agent and there is no–Doption to specify it. Obviously going through the firewall would require the opening up two ports and with random port it presents a delicate.Fortunately it is easily s

CentOS firewall operation instances (start, stop, open, and close ports) Note: basic firewall operation commands: Query the Firewall Status: [Root @ localhost ~] # Service iptables status Stop Firewall: [Root @ localhost ~] # Service iptables stop Start Firewall: [Root @ localhost ~] # Service iptables start Restart Firewall: [Root @ localhost ~] # Service iptables restart Permanently disable the Fi

Add open ports to CentOS firewallAdd firewall-cmd --zone=public --add-port=80/tcp --permanent (-Permanent takes effect permanently. If this parameter is not set, it will become invalid after restart)Reload firewall-cmd --reloadView firewall-cmd --zone= public --query-port=80/tcpDelete firewall-cmd --zone= public --remove-port=80/tcp --permanent1. Basic use of firewalld start: systemctl start firewalld v

you find the original-j reject a class of statements, the above two sentences to put in front of it2. Open the network port command line mode for external access:/sbin/iptables-i input-p TCP--dport 80-j ACCEPT #开启80端口/etc/rc.d/init.d/iptables Save #保存配置/etc/rc.d/init.d/iptables Restart #重启服务3. See if the Linux view port is occupiedNetstat-lntupDisplays all the ports and all the corresponding programs, usin

enabled by default. to open other ports, open the required ports. Vi/etc/sysconfig/ Iptables Then add -A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport3001-j ACCEPT -A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport3001-j ACCEPT Finally, the CentOS system needs to restart the ser

1. Open the configuration file[Root@localhost ~]# vi/etc/sysconfig/iptables 2. The correct configuration file# Firewall configuration written by System-config-firewall# Manual Customization of this file are not recommended.*filter:input accept [0:0]: FORWARD ACCEPT [0:0]: OUTPUT ACCEPT [0:0]-A INPUT-state–state established,related-j accept-a INPUT -P icmp-j accept-a input-i lo-j accept-a INPUT-m state–state NEW-m tcp-p tcp–dport 22-j accept-a INPUT-m

View Status:Iptables-l-NAdd the following methods for opening a specific port:Use Iptables to open the following ports/sbin/iptables-i input-p TCP--dport 8000-j ACCEPTSave/etc/rc.d/init.d/iptables SaveRestart ServiceService Iptables RestartSee if the port you want to open takes effect?/etc/init.d/iptables statusAct 2:or edit/etc/sysconfig/iptables directly-A inpu

View Status:Iptables-l-NAdd the following methods for opening a specific port:Use Iptables to open the following ports/sbin/iptables-i input-p TCP--dport 8000-j ACCEPTSave/etc/rc.d/init.d/iptables SaveRestart ServiceService Iptables RestartSee if the port you want to open takes effect?/etc/init.d/iptables statusAct 2:or edit/etc/sysconfig/iptables directly-A inpu

Installed TOMCAT7, found in addition to the function of access to the outside world, outrageous. So ask Baidu God, after a lot of trouble, the summary steps are as follows:1. Modify the file/etc/sysconfig/iptables[Email protected] ~]# cd/etc/sysconfig/[Email protected] sysconfig]# VI iptablesThe contents of the file are as follows, note that the red line is newly added to open 8080 ports to the outside worl

Download and install MySQL first ...Once configured, the default is to connect only from localhost. If you need a local area network connection (based on a LAN segment of 192.168 or 10.10 or 172.16), you need to do the following:First, login to the MySQL host command line and enter the following command:1, use MySQL;2.update usersethost =‘%‘where user =‘root‘;3,flush privileges;This will open the LAN connection.Similar on the WAN, adding configuration