Use tcp o udp para vpn
Instead, UDP continuously sends datagrams to the recipient whether they receive them or not.
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i use openvpn for android app and you can set number of profiles (each with different port and protocol) and  3 days ago 53 (1), UDP TCP, Domain Name System (DNS) Used for DNS lookups to discover the IP addresses of services in the Webex cloud.
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If you're connecting from a firewall-restricted network, try OpenVPN XOR with port TCP-443. Configure and setup your Cisco VPN router to restrict IPSec VPN clients to specific IP addresses, networks, TCP or UDP ports & network services. Restricting access to your IPSec VPN clients (or Groups) is possible with the use of standard or extended access UDP 2746 - UDP encapsulation (encapsulates IP protocol 50 ESP packets). UDP 4500 - NAT-T port for industry standard UDPÂ TCP 18231 - Policy Server login (seen on the network using SSL, if SecureClient/Endpoint Connect has an IP address in the VPN That is Transmission Control Protocol and User Datagram Protocol respectively. So these two port types use different network protocols. TCP is much more common than UDP and absolutely makes sure that all data is received free from errors. TCP is used by application protocols that need guaranteed message delivery.
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It relies on UDP and TCP protocols for transmitting data across secure VPN tunnels. UDP and TCP are both transport-layer protocols, required for establishing temporary connections between two programs, computers, or servers. With VPNs, you may have the choice between UDP and TCP. UDP is mainly used for online streaming and downloading. TCP is more reliable but also slightly slower than UDP and is mainly used for web browsing. You can watch our video for a more detailed explanation: The OpenVPN protocol itself functions best over just the UDP protocol. And by default the connection profiles that you can download from the Access Server are preprogrammed to always first try UDP, and if that fails, then try TCP. Unfortunately, on some more restrictive networks, all traffic except very commonly used ports are simply blocked. OpenVPN and other VPN solutions are flexible and can be operated either on TCP or UDP according to what you set.
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In fact, we encourage you to try out all the available protocols in the PrivadoVPN app. Find out which ones work best with your online activity. Very often with a good VPN service, you will have the option to use TCP (Transmission Control Protocol) or UDP (User Datagram Protocol) mode for your connection. Furthermore any provider that uses the industry standard ‘ OpenVPN ’ will have the option to switch between both protocols.
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However, you may discover that TCP is slower but more reliable. Another reason why you should use TCP with OpenVPN is stealthiness. Since SSL traffic uses TCP, port 443, you can often defeat censorship by configuring your OpenVPN to also use TCP and port 443. TCP is a connection-oriented protocol and UDP is a connection-less protocol. TCP establishes a connection between a sender and receiver before data can be sent.
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• When using TCP or UDP networks, the address parameter has the form host:port. The host must be a an IP address, or a host name that can be resolved to IP addresses. TCP/UDP Port 0 doesn't officially exist. It's a reserved system port in TCP/IP networking, used by programmers (or network Configuring a new network socket connection requires that one port number be allocated on both the source and destination side.