SSL error / Support for HTTP/2 ?

[dgupta-oanda]

I'm getting the following error when I try to send a PN through Knuff:

Connection failed: Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={_kCFStreamErrorCodeKey=-9858, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, NSUnderlyingError=0x600002f1b540 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 "(null)" UserInfo={_kCFStreamPropertySSLClientCertificateState=2, _kCFNetworkCFStreamSSLErrorOriginalValue=-9858, _kCFStreamErrorDomainKey=3, _kCFStreamErrorCodeKey=-9858}}, NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made., NSErrorFailingURLKey=https://api.development.push.apple.com/3/device/fdd3da9f67571a92680fa0175c4f8927bca997c6bcaae5dd99ac1ab1b32f2711, NSErrorFailingURLStringKey=https://api.development.push.apple.com/3/device/fdd3da9f67571a92680fa0175c4f8927bca997c6bcaae5dd99ac1ab1b32f2711, _kCFStreamErrorDomainKey=3}

I think this might be due to Apple recently enforcing the requirement of HTTP/2.