I know from other games like Company of Heroes that some routers just don't like each other due to their NAT implementation and always cause problems connecting with certain people. Routers like the Thompson Speedtouch/BT home hub which is fairly common are especially bad in that game.
I don't know specifically for ETW, but I don't have problems connecting with most people with my Linksys. Which was why I suggested trying a different brand router if possible to see if that helps in any way. Might have better chance of CA fixing connection problems if it was known more precisely what caused them and working around dodgy routers (yes I'm an optimist :p ).
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