During the incident window, we experienced an intermittent outage across different processing networks which resulted in unsuccessful transactions. Merchants processing in Europe, Australia, Canada, and New Zealand received an elevated rate of Processor Network Unavailable (3000) responses for the failed transactions.
An infrastructure operation was being carried out to restore the SSH File Transfer Protocol (SFTP) connection for a specific region. During this operation, several processor-connecting hosts were incorrectly taken out of service. As a result, processor networks on these hosts became unavailable, resulting in failed transactions. Engineers were immediately notified, quickly restored these processor-connection hosts, and traffic recovered.