How to get a UDP connection within LAN to work

[OnkelHolle]

Hello*,

in the enhanced options of teamviewer you can set the option "use UDP (recommended)". I did that both on the remote desktop pc as well as on my local pc. However teamviewer is always connecting with a TCP session to my remote pc. When I block the TCP ports in my local firewall, no connection at all can be established. Is there a way to find out why UDP is not working? Or did I miss anything to make it work?
Both PCs are within the same LAN, so no Internet connection is needed.

I know that LAN should be fast enough to use TCP connections, but even with my Gbit LAN I experience strange behaviour while using teamviewer. Every once and a while the connection "freezes" for a few seconds so that teamviewer doesn't recognize any input. I have to wait for about 10-20 seconds before I can move the mouse or click any buttons for exmaple.

Thanks for any help!
Regards,
OnkelHolle

[matt]

My thoughts on the "use UDP" are that Tv will use both UDP and TCP if this is selected, not as an alternative to TCP.

I say this because of the way that the UDP & TCP normally behave on Windows machines, not because I have any knowledge of how Tv implement this.