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List of TCP and UDP port numbers - Wikipedia 248 rows Port 53 (tcp/udp) :: SpeedGuide 14 rows UDP 53 - Port Protocol Information and Warning! Because protocol UDP port 53 was flagged as a virus (colored red) does not mean that a virus is using port 53, but that a Trojan or Virus has used this port in the past to communicate. UDP 53 – Disclaimer. We do our best to provide you with accurate information on PORT 53 and work hard to keep our database up to date. This is a free service GRC | Port Authority, for Internet Port 53
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Port Checker is a simple and free online tool for checking open ports on your computer/device, often useful in testing port forwarding settings on a router. For instance, if you're facing connection issues with a program (email, IM client etc) then it may be possible that the port required by the application is getting blocked by your router's telnet to port 53 If you are trying to see if connectivity works on DNS request (normally uses UDP/53), then the answer is no, telnet on port 53 will not work. If you are trying to test DNS resolution/request, then just use "nslookup" from command prompt, then specify the dns server: server , then test the resolution: cisco.com Why is port 53 open on the WAN side of the router? And more importantly how do I close it? Port 53 is not one of my forwarded ports. Discovered by doing nmap -pT:1-64 <my-external-IP> -Pn Jul 13, 2005 · The domain name service provided by BIND (named) software. It uses both UDP and TCP protocol and listen on port 53. DNS queries less than 512 bytes are transferred using UDP protocol and large queries are handled by TCP protocol such as zone transfer. ADVERTISEMENTS i) named/bind server – TCP/UDP port 53 ii)Client (browser, dig … Continue reading "Linux Iptables block or open DNS
DNS primarily uses the User Datagram Protocol (UDP) on port number 53 to serve requests. DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. When the length of the answer exceeds 512 bytes and both client and …
When I try switching it to port 53 I suddenly start getting this error: “Handshake did not complete after 5 seconds, retrying” All firewall rules have been set correctly and the server is running on Ubuntu 18.04 Lts. EDIT: Turns out all ISP/mobile providers block UDP VPN connections on port 53 in Singapore.