tcpdump - University of California, Berkeley
Nmap scan report for scanme.nmap.org (64.13.134.52) Not shown: 65530 filtered ports PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 4.3 (protocol 2.0) 25/tcp closed smtp 53/tcp open domain ISC BIND 9.3.4 70/tcp closed gopher 80/tcp open http Apache httpd 2.2.2 ((Fedora)) |_HTML title: Go ahead and ScanMe! 113/tcp closed auth Device type How Amazon Route 53 determines whether a health check is TCP health checks – Route 53 must be able to establish a TCP connection with the endpoint within ten seconds.. HTTP and HTTPS health checks with string matching – As with HTTP and HTTPS health checks, Route 53 must be able to establish a TCP connection with the endpoint within four seconds, and the endpoint must respond with an HTTP status code of 2xx or 3xx within two seconds after TCP Port 53 Open - How to enable UDP 53? Mar 16, 2005
Ports are endpoints between two connections. A port number is assigned to each end, like an address, to direct the flow of internet traffic. If you’re having trouble connecting to any of our online games — and you have tried basic connection troubleshooting — you may need to open some ports on your network connection.. Consoles
GRC | Port Authority, for Internet Port 53
Mar 16, 2005
Commonly Hacked Ports - dummies TCP and UDP port 53 — DNS (Domain Name System) TCP port 443 — HTTP (Hypertext Transport Protocol) and HTTPS (HTTP over SSL) TCP port 110 — POP3 (Post Office Protocol version 3) TCP and UDP port 135 — Windows RPC. TCP and UDP ports 137–139 — Windows NetBIOS over TCP/IP. Transmission Control Protocol - Wikipedia The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite.It originated in the initial network implementation in which it complemented the Internet Protocol (IP). Therefore, the entire suite is commonly referred to as TCP/IP.TCP provides reliable, ordered, and error-checked delivery of a stream of octets (bytes) between applications running on hosts telnet to port 53 - Cisco Community However DNS use BOTH Udp and Tcp so it listens on both protocols. Udp for small stuff like asking one address or something like that, and for larger transfers such as zone and so on it will switch to using Tcp. so yes it might work to test with using tcp port 53.