Hello guys, i have the same problem using version 3.4.2 wordpress 4.9.6
Tried everything to figure out what server its trying to contact. There is no firewall, no wordfence
error displayed on wp-login.php page only.
Tried with rates disabled, and with all the options one by one and the same error. Also tried with legacy API option and using BTC only, altcoin and same error.
Any idea what i can try ?