By default, Mobile VPN with SSL operates on the port and protocol used for encrypted website traffic (HTTPS) to avoid being blocked. This is one of the main advantages of SSL VPN over other Mobile VPN options. We recommend that you choose TCP port 53 or UDP port 53 (DNS) to keep this advantage.
Feb 19, 2020 Commonly Hacked Ports - dummies 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. TCP port 1433 and UDP port 1434 — Microsoft SQL Server 18.9. Secure TCP/IP Connections with SSL - PostgreSQL
Mahesh, to establish a remote access SSL VPN to your ASA, yes TCP 443 will suffice throught the router. When you enable the certificate and webvpn on the outside interface as part of the VPN setup that tells the ASA to listen for the incoming SSL - so you don't technically "open" 443 on the ASA.
TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP. UDP ports use the Datagram Protocol.
Remove the statement //p_tcp_ports or //x_tcp_ports that matches the port range you want to remove. If the port to remove is in the middle of the range, then provide the rules to follow.
Changing a TCP or SSL port number - help.hcltechsw.com The port-mapping partition listens on port 1352 and redirects IBM® Notes® and IBM Domino® connection requests to the other partitions. Changing a TCP or SSL port number. The following sections describe the TCP ports that IBM® Domino® services use and provide guidelines should you ever need to change these ports.