Hi team, one of my customer is building their SaaS application on our cloud instance and testing Apple SSO environments. Public IP address of relevant instances are located in South Korea and they've experienced intermittent connection failure when they try to login Apple SSO. As per we investigated this issue, we've found out that IP address of relevant URL (https://appleid.apple.com/auth/keys) is changed. Below are few IP addresses that make connection issue and we want to know that if these IP address are actually valid IP address of belonging URLs. [IP address that we cannot make SSL connection] 17.188.23.52 17.188.23.24 [IP address that normally makes successful connection] 17.111.105.242 Moreover, one of the notable difference between those IP addresses are we cannot lookup domain on above IP addresses using our laptop whereas below IP addresses normally received domain from our laptop. Please kindly look into this issue and let me know if those IP addresses are validate on belonging URLs. Thank you. Regards,