Over the past few hours we've been seeing errors when attempting to connect to the APNS Sandbox push service using the HTTP/2 provider API. We've confirmed out push certificate is valid and for the correct topic/app ID.
I've tried following the troubleshooting steps here: https://developer.apple.com/library/archive/technotes/tn2265/_index.html#//apple_ref/doc/uid/DTS40010376-CH1-TNTAG31
When I test out the TLS/SSL handshake with OpenSSL, I get a handshake failure error:
139925350537104:error:140790E5:SSL routines:ssl23_write:ssl handshake failure:s23_lib.c:177:
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no peer certificate available
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No client certificate CA names sent
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SSL handshake has read 0 bytes and written 289 bytes
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Our root certificate appears to be valid, and so far production APNS doesn't appear to be affected, as we're still seeing those push notifications sent successfully.
Has anyone else encountered this? I'm wondering if this is a problem on our end or some issue with the APNS Sandbox service?