x64 client and DirecX 11

[Yarbro]

I have just tried to login using the 64 bit client and have received 3 connection failed attempts, i.e. 20 attempts to login each time and then connection failed.

after switching back to 32 bit, standard login with no issues.

Your firewall is probably blocking the 64 bit client, after updating my one system BOTH clients got blocked and needed whitelisting.