User blog comment:Otakon7/Otakon7's Buddyfight Simulator/@comment-33027141-20171229075531/@comment-2234004-20180106113905

so i don't think a single card in one deck makes a timeout error

Oh trust me, it can, if even so much as a letter is off in the structure, everything breaks. Happens usually when the structure of the deck si changed, but given I haven't chagned things in a while, shouldn't be a problem.

But yeah, seems to be a thing with your wifi settings (a firewall?) if it works at your friend's.