HTTP GET Request on port 53 – OpenDNS
Dec 12, 2015 · Hmmm, according to netcat, the domain www.google.com.sg has both UDP ports 53 and 139 open, which is highly unlikely. I have seen that with the netcat-openbsd package, netcat reports that a UDP port is always open even if it is actually closed (at least on Ubuntu). Port 53 is extremely sub-optimal for OpenVPN. Some providers block access to external DNS (UDP port 53). I’m sitting on a hotel network now where that is the case. Using Telnet to Test Open Ports. One of the biggest perks of Telnet is with a simple command you can test whether a port is open. Issuing the Telnet command telnet [domainname or ip] [port] will allow you to test connectivity to a remote host on the given port. Issue the following command in the Command Prompt: telnet [domain name or ip] [port] Jun 02, 2018 · On the issue of ports, does anyone know if there is a good reason for port 53 (DNS) to be open on the Blink sync module? I installed the Netscan Android app which shows port 53 allocated to the module. The ‘Shields Up’ website confirms port 53 is in ‘stealth’ mode somewhere on my network (although I’m not exactly sure what that means). The article also mentions UDP port 80, but it's unclear whether it also needs to be opened. You will need to create 2 or 3 port forwarding entries on your router (one for TCP port 8883, one for UDP port 2165 and possibly one for UDP port 80), as per the article. We can check the ports that are opened in the current default zone with ‘--list-ports’. [[email protected] ~]# firewall-cmd --list-ports 100/tcp As expected we see that TCP port 100 is open. Should we wish to remove a port, we can use ‘--remove-port=’ instead. We can also open a range of ports in the same way. Table 1: Default (Trusted) Open Ports Port Number. Protocol. Where Used. Description. 17. TCP. controller. This is use for certain types of VPN clients that accept a banner (QOTD). During normal operation, this port will only accept a connection and immediately clo
TCP port 53 is used for domain transfers; the only reason I can see it being open is if the OP is running a DNS server. DNS servers also listen on UDP port 53 to accept queries from client resolvers. Port 53 was open on my 12.04 machine because I had an instance of bind9 running, and it was listening to that port.
2020-6-30 · Open a Port or Service. There are different ways to open up a port (range) or service. These ways depend on the use case and the number of changes that are needed to make it work. A simple port number or port range can be used in the cases where no additional changes are needed. For example with opening port 80/tcp to allow access to a local Trying to get ports 53 & 8883 open for inbound & outbound
Jul 03, 2017 · The column at the far right lists PIDs, so just find the one that’s bound to the port that you’re trying to troubleshoot. Next, open up Task Manager by right-clicking any open space on your taskbar and choosing “Task Manager.” If you’re using Windows 8 or 10, switch to the “Details” tab in Task Manager.
How to open DNS port 53 using ufw on Ubuntu/Debian … 2020-5-17 · H ow do I allow incoming DNS tcp/udp port 53 connections from a specific IP address or subnet on a Ubuntu or Debian Linux server using ufw? How can I open DNS port 53 using ufw firewall? Introduction: UFW is an acronym for uncomplicated firewall.It is used for managing a Linux firewall and aims to provide an easy to use interface for the user. In this tutorial, you will learn how to use UFW a