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Outgoing UDP anomaly

user123456789
Newbie
Posts: 3
Registered: 09-11-2015

Outgoing UDP anomaly

Hello
For the last couple of days I have been unable to play Counter Strike or login to Steam (it's definitely up).  I think it is due to 'something weird' happening to my UDP traffic.  I start "Steam.exe -tcp" to use only TCP and login to Steam works fine, however playing the game online never works, as I assume UDP is required in-game.
There's been no change to my router, running Wireshark on a laptop with Steam and Counter Strike running in UDP mode shows absolutely no UDP traffic coming back to the laptop from the Internet.
Any ideas?
Many thanks