"Lol, had similar issues on my TS3 server recently, turned out it was a router settings tweak that fixed the problem. Maybe resetting your router and checking firewall settings might do the trick? Anyone else try updating their TS3 client?"
"Hey guys, had the same issue on my TS3 server lately. It seemed to be caused by a faulty network card, swapped it out and the problem went away. Anyone else try swapping components?"