Reference: TLS Ciphers Supported by GlobalProtect Apps on iOS 10.2.1 Endpoints

The GlobalProtect app for iOS 10.2.1 supports 19 cipher suites.
TLS Ciphers Supported by GlobalProtect Apps on iOS 10.2.1 Endpoints
TLS_EMPTY_RENEGOTIATION_INFO_SCSV (0x00ff)
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_ SHA384 (0xc02c)
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_ SHA256 (0xc02b)
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_ SHA384 (0xc024)
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_ SHA256 (0xc023)
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA (0xc00a)
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA (0xc009)
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (0xc027)
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)
TLS_RSA_WITH_AES_256_GCM_SHA384 (0x009d)
TLS_RSA_WITH_AES_128_GCM_SHA256 (0x009c)
TLS_RSA_WITH_AES_256_CBC_SHA256 (0x003d)
TLS_RSA_WITH_AES_128_CBC_SHA256 (0x003c)
TLS_RSA_WITH_AES_256_CBC_SHA (0x0035)
TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)

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