I have had this error a while. Changed from wireless to wired connection last December which worked until last week when it suddenly lost connection completely. I have installed a new wireless card but am still getting this error. I have worked through various possible solutions with no luck (see forum post Network card - #14 by Sandsh-draenor ) and today have tried doing a full reset of windows but am still getting the error. I have an old laptop that plays WOW fine on the same network. If anyone has any ideas it would be appreciated. Local pc shop is currently shut due to the lockdown.