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log into your router and open port 27015
TCP stands for Transmission Control Protocol and
UDP stands for User Datagram Protocol.
It's not whether if UDP or TCP is better or not as one might be applicable for a certain
situation and the other one might not be suitable.
UDP is mainly used for applications that require fast transmission
and what not like games, VoIP, video streaming, etc.
UDP is fast because it has no error correction and is kinda like
"I don't care, just quickly give me the packets".
On the other hand, TCP has error correction and checks if the packet is
okay or not. If it's not okay, a request is sent back to resend the packet
until the packet is correct. It also has congestion control.
TCP is mainly used for applications that requires the packets to be precise such as
websites, downloads, etc.
So to sum it up, TCP is mainly for reliability/efficiency and UDP is for speed but in
some cases, TCP might be faster than UDP.
(If anything I said here is wrong, please don't hesitate to correct me)