1 Topic by Neil.Kurzman (edited by Neil.Kurzman 2025-12-31 00:04:50)

  • Registered: 2025-08-04
  • Posts: 8

Topic: Azure Limiting Cypyers

I am getting an MQTT Error 5
This is related to it rejecting Cyphers
The List Below is the Acceptable list as of August 31, 2025
Oddly I can connect to one Hub But Not a Second.
Does Wolf SSL V 3.9.0 handle anything in the Below List?
I am using Microchip Harmony V1.11 so I am limited to V3.9.0
Does SLL Choose the Cypher or do I need to set it.

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384

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  • From: Mobile, AL
  • Registered: 2013-12-11
  • Posts: 387

Re: Azure Limiting Cypyers

Hello Neil,

Yes those ciphers are supported wolfSSL v3.9.0. Do you have a packet capture and / or wolfSSL debug log of the succeeding and failing connections?

The server ultimately chooses the cipher suite based on the list sent during the client hello message of the TLS handshake.

Please feel free to open a support ticket by emailing support@wolfssl.com to get more detailed help.

Kind regards,
Eric - wolfSSL Support

embhorn's Website

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  • Registered: 2025-08-04
  • Posts: 8

Re: Azure Limiting Cypyers

I am trying to use the log to debug it will required some work in my embedded system.
There does not appear to be any function to get the list, or to get the current cypher.  Is the correct?

I found to enable the Cypher i needed to enable options in the Harmony Cyphers are we as The Wolf SSL Cyphers.

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