Worldpay callback fails, CAUSED BY invalid HTTP status line: >null<

Hi Community,

we’re currently seeing a lot of callback issues from our Payment Service Provider Worldpay. Whitelisting the AS and the callback URLs did not solve the issue. After deactivating Cloudflare for the domain, the issues has been resolved.

Does anyone have a tip on what type of configuration could be causing the error below?

Error reported: Callback to: https…[URL removed] …: failed CAUSED BY invalid HTTP status line: >null<
Server Reference: ukdc2-pz-pay05:callbackFailureEmail-30599:MerchReq-794-50

The server behind cloudflare does not even receive this callback, so my assumption is that it was blocked by cloudflare?

Best regards,

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