Month: March 2018

Have you ever wondered whether AWS CloudWatch percentile metrics remain accurate as the granularity of data is increased over time? I asked AWS about this, and apparently the answer is yes, they do, but they won’t tell me exactly how. A trade secret, perhaps.

I recently had some trouble deploying an app to AWS after enabling HTTPS/TLS on the application because the health check was failing. It turned out that because I had also restricted the list of ciphers my app could use (per my organization’s security recommendations), the ELB was unable to connect to the app because it did not support any of my app’s ciphers. Unfortunately, the AWS docs do not explain what ciphers are supported between a classic ELB and the app. So, here’s the current list:

TLS_RSA_WITH_AES_256_GCM_SHA384 (0x009d)
TLS_RSA_WITH_AES_256_CBC_SHA256 (0x003d)
TLS_RSA_WITH_AES_256_CBC_SHA (0x0035)
TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x0084)
TLS_RSA_WITH_AES_128_GCM_SHA256 (0x009c)
TLS_RSA_WITH_AES_128_CBC_SHA256 (0x003c)
TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)
TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x0041)
TLS_RSA_WITH_RC4_128_SHA (0x0005)
TLS_RSA_WITH_3DES_EDE_CBC_SHA (0x000a)
TLS_DHE_DSS_WITH_AES_256_GCM_SHA384 (0x00a3)
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (0x009f)
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (0x006b)
TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 (0x006a)
TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x0039)
TLS_DHE_DSS_WITH_AES_256_CBC_SHA (0x0038)
TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (0x0088)
TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA (0x0087)
TLS_DHE_DSS_WITH_AES_128_GCM_SHA256 (0x00a2)
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (0x009e)
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 (0x0067)
TLS_DHE_DSS_WITH_AES_128_CBC_SHA256 (0x0040)
TLS_DHE_RSA_WITH_AES_128_CBC_SHA (0x0033)
TLS_DHE_DSS_WITH_AES_128_CBC_SHA (0x0032)
TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (0x0045)
TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA (0x0044)
TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA (0x0016)
TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA (0x0013)
TLS_EMPTY_RENEGOTIATION_INFO_SCSV (0x00ff)