I’ve updated myself avast all the damn hit I can not connect to battle.net HELP !!!
Not possible to give help without knowing details.
But let me guess.
The error.(see the log file) is 41227.
If so, change your DNS to the one from Google as has been explained many times already.
The Google Public DNS IP addresses (IPv4) are as follows:
8.8.8.8
8.8.4.4
The Google Public DNS IPv6 addresses are as follows:
2001:4860:4860::8888
2001:4860:4860::8844
https://developers.google.com/speed/public-dns/docs/using